cartridge setup help

It came with a bagful of screws and nuts from AT, but nothing seems to fit firmly in the channel. 

Anyone want to give it a try for $100?

vegasears, thank you so much. I passed on your info to my friend. 
Nandric, I think i mean it is a non threaded cartridge body. If you look at a pic online it looks like an open channel for the screws. BTW, he was using a Clearaudio Virtuoso that I had purchased from you years ago. We were playing an old Elvis 45, and the needle went flying and snapped off the whole cantilever. 

Thanks Nandric, but I sent the Virtuoso to Andy Kim for a rebuild.