Record Clamp RS-1. It is the amount class record stabilizer of inside with 84mm in diameter, 20mm [ in height ], and a weight of 380g. Since it is designed so that a record board may be touched only in a perimeter part on the back, a record board is not dumped too much, and the merit of sound is the feature. gun money began to delete, it came out, and the quality of the material has adopted nonmagnetic silver plating smoked finish. It is considered so that the magnetism of a cartridge or a turntable may not be affected.
Machined in solid Bronze, with a plating also known as "smoked silver".
A record has very low weight, laying loose on the platter, and most records are not even fully flat. The needle plays in the groove, at at this point, forces divide equally in two directions. The force which the groove puts on the needle is equal to the force the needle puts on the groove. This force is very large actually, and it makes the record produce a mechanical noise, equal to the music.
For this reason, a record player has a heavy platter, with a damping kind of coverage. However this doesn't bring much if the record lays loose on the platter. Suppose you listen to a tone, coming from a guitar string. It will be reproduced will by the cartridge of course. However the tone from the needle will also find it's way through the record vinyl itself, and after some reflections against the edges, reach the needle a second time, and more times, each with small time delay. Also, harmonics are generated that way. The effect is similar to unwanted room reflections. Since the effect is not so extreme, a person will not hear this directly as reflections. However the human ear will get tired from this sooner. If you ever heard the difference of a listening room with hard walls and a hard floor, and the same room with damping materials, you will know the effect. Sound doesn't change, but you can hear it longer, and not get tired.
So the record clamp is not so much a clamp, it is a necessary element to minimize acoustical resonances and reflections inside the record body, any by this greatly improve the sound. You are listening only to the sound that is produced by the groove, needle, and no longer to reflections and resonances is a loose laying record.
The Yamamoto Soundcraft Corporation is the HiFi branch of a Japanese machinery company. The large technical possibilities the mother company has, together with Mr. Yamamoto's deep knowledge about materials, and about electronics design has resulted in this wonderful and unique line of products. The special situation here is, that the Yamamoto Soundcraft company does not have to use mechanical parts from other companies. Whatever they need, they make it themself, just the way they want it. Resulting from this is the prestine quality level of the used components.
Until 2003, the company was mainly active in Japan only. With the coming of the internet, and growing interest in tube amplifiers, international sales just "happened" to the Yamamoto company. Until then, the company was mainly known in the Japanese-only tube scene. (which is a scene for itself !) But...the internet changed the way of working. There a lot of awards and articles on Yamamoto products.
Mr. Yamamoto always presented the Audio scene surprizingly beautifull and well-designed HiFi Equipment, made of finest base materials. 
The accessories Mr. Yamamoto designs are genious products, and improve the performance of existing equipment. They are built built to exceptionally high standards: "Handcrafted" as a tag rarely ever signifies this level of bespoke luxury.
Yamamoto Sound Craft makes phono cartridges, head shells for those cartridges, a step up transformer; a phono equalizer amplifier plus a whole lot more. As you can tell Yamamoto-San is a true believer in the joys of vinyl. One of the most demanded Yamamoto accessories is the headshell made from the african ebony wood of the specific gravity 1.4, it is also used for clarinet, oboe, etc. In wood, a clear and forcible sound is the feature because of a very hard and tough material.
--- Shigeki Yamamoto ---
Here, Mr. Yamamoto demonstrates a test record player for the Japanese magazine "Analog". Please don't ask.... it is not for sale. This was only a study, showing the excellent sonic capabilities of the special treated hard wood as used for all products. 
This specially treated cherry wood is called Shashi, and has properties like Ebony wood. So it is the secret tip for Audio products, and of course the #1 choice for the HiFi equipment made by Yamamoto Soundcraft.
Shigeki Yamamoto's professional background includes experience as a high-tech machinist—some of the best and most expensive amplifiers on the planet use his precision-made Teflon tube sockets—and his product gallery is itself a portrait of an audio craftsman with greater-than-average determination: When Yamamoto has an idea for a new kind of capacitor housing—or horn, or moving-coil phono cartridge, or equipment stand, or whatever—he simply gets to work and makes the thing himself. That sort of talent seems out of place in a corporation, or in a field of endeavor that misguided souls have allowed to be dominated by a corporate mentality.
Mr. Yamamoto's music preference is jazz recordings, and he is a very critical listener. His personal experience is, only the finest, natural materials can be used to reproduce the sound in the original way, as it was recorded. For this, no weak elements can be tolerated in the entire sound chain. Only in this way, a true reproduction of the original music will be made possible, with finest details occurring that can not be heard otherwise. This search for originality and perfect materials implicates not only the use of tubes. 
It means every part of the product is subject to a careful selection process. Also the use of hard wood and other natural materials plays an important role in the complete design.
--- The Choice of materials ---
The Japanese Audiophile scene uses only original materials of highest quality and originality, going allways back to the root of the products. There is no interest in new inventions, but allways the search for originality comes first. Japanese tube enthusiasts like to improve products, but never loose the philosophy of the original design. This is how they are. You will find this quality attitude in all traditional Japanese companies like Yamamoto Soundcraft is one. They have a word for this, called Kai-Zen. It means so much as great dreams, small steps.
