The PT-19 gear had worked loose, so I redrilled and bushed the hole. Last flight, my partner told me that my tip weight had come loose. When I got it home, I opened the compartment and everything was where it was supposed to be, so I opened the covering and checked. I found 2 wood blocks with a 1/8" hole in the middle. They were the gear reinforcing blocks. There was no trace of glue on them. Now for plan "B".