Glad to hear it.

I discovered those felt clunks about 10 years back, when I needed a rather small tank in a gas (petrol) model. Someone told me that they will get every last drop of fuel out before letting air pass... and they were right!!! When I built my first jet, I bought a UAT and spent $50 on it... but after a while, I noticed that there was some wetness around it, and I couldn't ever get the cap to seal 100%. Then, I built a small jet (wren 44) and my $50 UAT was causing flam-outs. (getting a little air past the cap) So... I grabbed a 4oz dubro tank, petrol stopper, and a felt clunk. Never had an issue with that, and it cost about $10. Ever since then... I just build my own.