I've blown/cracked/grenaded the caps while installing them too.
Suxs. Which is one reason why I have carried assembled front shafts.
I'd be prone to leave the assembled shaft alone, run it, and install whatever ujoint you have handy that's of good quality.
If you need a 760 style ujoint, I probably have ~7-8 of them of various flavors in my trail bag.
I'm headed over to Taylors house soon to help him disassemble his HPD30, and swap all my old HPD30 stuff over. So if you need me for something, call me on my cell.