I wish I would have read that earlier. I didn't even think of dry fitting the centering ring to install the forward one. I tried thinking of a way to do that but I thought I would have trouble keeping the motor tube centered. I guess this is how you learn.
I got most of the rocket built today. All I have left to do is the rail buttons, fin fillets, and motor mount fillets. Then paint. I came up with a couple more questions though. For the shock chord I just tied a double knot when I installed it. One thing I was wondering though, was the use of D-rings. Are they strong enough? And for the finishing of it. I bought some wood filler for the spiral grooves in the tube. I was messing around with it and put some on with just my finger. It worked well but was messy. Any suggestions?
And lastly, I was reading about the level 1 cert process on the TRA website. It mentioned you must mark the center of pressure on the rocket. What is the easiest way of calculating this? I will not be able to have a real accurate CG until I get to the launch site because that is where I am purchasing my motor. Sorry for the lengthy reply, but thank you for all the advice.
Dave