Set Triggers..... Help!!

[SageRatHunter]

I just bought a used Thompson Center Hawkens 50 caliber, beautiful condition for $75.00 last night. I haven't shot it yet but did find one small problem already. The rear set trigger does not do anything, no tell tale "click" no change in the forward trigger period. Any ideas on how to fix this or what may be causing it? I tried turning the little screw by the triggers either way but no change. Any help would be appreciated before I have to take it to the shop.

Thanks,
Dan