pcomm1 , If you are having trouble fitting the flash unit into the barrel remove the shrink tubing around the length of the wiring. Trim the shrink wrap around the flash unit but do not remove it. Pierce a small hole at the end through the shrink wrap and tie a piece of thread through the hole. Insert the thread through the breach end and pull the flash unit through the barrel feeding it in as you go. It should fit without the shrink tubing. I've done this with a flash unit that i have and it did fit. BTW, did the tips fitting the transmission cover work out? Hope so.
Thanks,
Nick Aguilar