Started riveting floor chanels to the firewall engine mount fitting. Its a tight fit so the rivets must be pulled with a had puller. My close quarters hand puller "Pop" brand from Avery Tool Supply striped out pulling the stell rivets. This tool was recomended by Glenn from the RansClan and I really like it because it fits into very tight places. Hoping this was just a fluke, I put in a order for a new one. In the mean time I will trial assemble the fuselage pieices to make sure I understand the fit and function.