to find a diagram of the TF 99 assembly nowadays. It is a old chinese model. I haven't fix one of these in long years, so I really don't remember off the bat. What I do remember it was fairly easy to deal with compared to other models, but all trigger assemblys can be tricky. It has a basic 2 stage trigger assembly. Maybe you can find a link that may help you on my link page at: http://air_guns.tripod.com/links.htm
Kermit is a real nice guy, prehapes if you send him a message he might be able to help you find that diagram of a trigger assembly you are looking for.
I hope this helps.
Good luck.
Eddie
Posted on Dec 20, 2008, 3:41 AM from IP address 24.139.188.218