The guys on the Van's Airforce forum seem to all like tungsten bucking bars so I thought I'd give one a try. I ordered mine from Tungten Heavy Powder, Inc. The stuff really is a lot denser than steel; quite noticable when you pick it up.
I ordered a pneumatic riveter on ebay. The RV-4 plans suggest it for rivetting the wind main spars. It should make quicker work of a lot of the squeezable rivets compared to my Avery hand squeezer.
