These things are great! I did almost all the rivets for the main spar with a little bar about 1 1/4 x 3/4 x 1 which is somewhat triangle shaped. It only weighs about a pound but with all the weight in that little area it works really well. It is a lot easier to control the bar because it is all right in your finger tips. Anyone else tried tungsten. I know that Bill Repucci from one of the other boards listed it as one of his favorite tools, now I know why.
Even on Ebay they seemed pretty pricey. Finally I called and talked to a place that sold them (can't say were) and told them what I wanted to buy and what I was doing with it. To make a long story shorter they had 6 bars that were basically rejects or broken from larger bars. He assured me that they would work great for my pupose of building the 7 but wanted to sell all of them at once. We worked out a price and I bought all 6 of them. I plan on selling 4 of them on Ebay once I figure out which ones I want to keep. 
