I'm going to mount a London Decca International tonearm soon and it came with a small satchel of oil to pour into the top of the arm pillar to provide damping and reduce arm resonances and "chatter".
Being 50 years old I'm reluctant to use it but there is no mention of the viscosity in the manual. Only that it will be very slow to pour and may take overnight to properly travel to the bottom of the damping well. "TurntableBaics.com" sell various viscosity silicones and recommend 600,000 cst for monopivot damping wells. Trouble is, I've seen some quotes that this stuff is ridiculousy thick and, if I "gum up" the tonearm movement, I've got as good as no chance of ever getting it out again.
Has anyone ever used these very thick silicones for this purpose and can advise which is best - I've emailed Turntable basics but they haven't answered and apparently are notorious for not doing so.