Thanks guys, it give me the confidence to try patching them.
I have Zipp 303s and use the Zipp tubes with their valve extenders, they're $10 each so not cheap. My spare tube is a Bontrager with a 60mm threaded stem. The tube is bullet proof as i've used it and reused in more times than i can remember. The stem rattles a bit where the Zipp tubes do not... and the Zipp tube just looks better.
I'll have to stop by the LBS and get a permanent patch kit and give it a try.
Thanks again.