Originally Posted by
richeydog
I bought the new bottom bracket from amazon (bb-un26) and tried to install it myself but ran into a problem. It wouldn't go in because the bb shell threads were worn. I took it to the shop, they chased the threads and installed it for me.
Can you turn the ends of the BB by hand, or wiggle them? If so, the chasing may not have left enough thread in the shell for the BB to grab. If that happened, your only option may be to install a threadless unit. I'd ask the LBS for some store credit if the thread-chasing was unsuccessful, unless they warned you that the operation might not work. Maybe you could buy a threadless unit and ask them to install it at no charge?
BTW, what kind of bike is it? Some have shells wider than 68mm, the size required for most sealed BBs.