The Davenport's wrote:
The Yard Aircraft Tools, sells a tungsten bucking bar. Not cheap, but
smaller and denser than any steel bucking bar.

Dunno if the block size would work for you, but you might look there.


http://www.yardstore.com/index.cfm?a...ls&ItemID=1738

PN: 74102
Tungsten Bucking Bar

* 2.87 lbs.

Try one of our "Vibration-Free" Tungsten Bucking Bars!

According to a recent University study, bucking bars made with tungsten
are
much safer for the operator by reducing vibration. The density of tungsten
is the future of bucking bars available at The Yard today!

At The Yard all of our Tungsten Bucking Bars are made from 90+% tungsten.
All edges are deburred and working surfaces are polished for trouble-free
use. Your hands will thank you.

Wes


OK...so I'm a little slow, but what in the hell is a bucking bar???

Mike


Solid back-up for setting aircraft rivets or other solid rivets.

A fitted snap is placed in an air hammer, to drive the rivet from the
head end, and a bucking bar is placed against the opposite end while the
rivet gun or air hammer is activated.

Tungsten is a good pick, as it is very heavy, and the mass allows a
heavier bar in a limited acces space.

That about cover it?

Cheers
Trevor Jones

Try Google. Betcha it comes up with a more detailed answer!