Do you mean to fill the bars making them solid not hollow?

you can try small amounts first and add to it if need be, when the siliconce sets like rubber it absorbs vibration, there is a company who makes a specific product like this i will try and find it and add a link

http://www.barsnake.com/order/secure.html

Cheers for that, it does make sense now.

For the cost of a tube or two of silicone its worth a go, cant do any harm.

as an after thought i would probably pull a wire thru maybe with some knots in it before you add it just in case you need to get it out for any reason in the future

Cant see any reason why i'd need to take it out but yeah, another good idea.

2 questions here, Kev:

#1. From you experience, what's the minimum amount of space that needs to be left between the brass weight and the inner wall of the bar ?

#2. Is there any reason that makes brass a recommended material for the inner weight (over, say, steel) ?

The first mod I done was to make a set of vibenators , Pack the bars with sand to the 2nd bend with corks pushed in to hold it in place , a set of heavy stainless steel end weights.... all worked but still had vibes though the bars...

By far the best mod was a set of ROX anti vibe risers... killed the vibes all but 100%... useing the ROX risers gives 2 sets of anti vibe rubbers....
Another good point with them is you can lean them forward or aft to put the bars where you want...makes the bar postion totaly tunable...

http://i1244.photobucket.com/albums/...1/SAM_0070.jpg

http://i1244.photobucket.com/albums/...1/SAM_0071.jpg