The term is elastomer.   I would expect a substantial damping

effect from

encapsulating the bolt in RTV.  One thing to worry about is

totally filling the

cavity.  RTV has a VERY high CTE and in a fully trapped (and

sealed)

application can generate EXTREMELY high, essentially unlimited

forces

when heated.   I have seen a 2" thick 12" diameter flat steel lid

attached to a

thick walled 12" steel tube with eight 1" studs deform enough to

let the cured

RTV dribble out when heated to 350F.   Leave a bit of air space or

it WILL

make room.

If the bolt problem is guitar string type of vibrations (lateral
vibrations), then
providing an elastomeric doughnut (sleeve, tube, whatever) in the

middle

which is snug on the bolt and in the hole will dramatically detune

the system

and provide substantial damping.  Both are good.

If the bolt hole size is consistent, I'd use a sleeve in the

middle portion.

Sounds
like what the 20B has.  It needs to be a snug fit in the hole,

does not need

to cover the whole bolt, does need to be in the middle, at least

approximately.

Bill Freeman

        A couple of "O" Rings in the centre of the bolt,
 Virg

 
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