rajul I can't tell you how many times I have read about stock tanks/stoppers failing. I never use stock tanks. I used a Sullivan 13 oz standard on my UCD after having been burned twice by stock stoppers when I first stated flying. Never had a problem since. I should have listened to good advise the first time I had one fail, but after two failures there is no excuse.

Joe, I can't imagine why the delay on your parts. I have ordered from Quantum before and they responded promptly. I needed a Sullivan Megatron starter for my first Pitts project. No one else had one and they were on back order four weeks. Quantum sent one to me and I had it in just a few days. Maybe the parts were on back order. I waited two weeks to get a new set of wheel pants for the WM Extra.