This " tweak " only benefits the person selling a piece of metal to sit on top the cradle.
Originally Posted by
Ammonite Acoustics
This tweak is
only suitable for arms where there is a separate structure surrounding the pivot and
absolutely not on the pivot itself - as with the Jelco SA-750 series and my FR64S. Look at this picture of my SA-750E and you can see that the mass damping weight sits on top of the cradle and does not go anywhere near the bearing structure (on these Jelcos that cradle does not touch the 'drum' housing the bearings):
Do not under any circumstances think about placing any mass or weight directly on an arm's pivot, since this will only result in disaster (excessive bearing loads, uneven mass distribution, etc). In the case of the FR64S, the flat top of the arm structure does rotate with the arm, but it's only in the horizontal plane, and the horizontal bearings are built like bits of battleship, so adding a mass there does not influence the vertical movement of the arm tube at all.
See
http://theartofsound.net/forum/showt...721#post841721 for an explanation of why this works,
in suitable tonearms.
Bakoon 13r Denon DP80 Stax UA-70 Shure Ultra 500 in a Martin Bastin body with jico stylus, project ds2 digital Rullit aero 8 field coils in tqwt speakers
Office system, DIY CSS fullrange speakers with aurum cantus G2 ribbons yulong dac Sony STR6055 receiver Jvc QL-A51 direct drive turntable, Leema sub. JVC Z4S cart is in the house
Garage system another Sony receiver, cassette deck
System components are subject to change without warning and at the discretion of the owner.