I have a 1967 uberti 1851 round barrel. The hammer notches are worn out, and the hand and main spring broken. Will the parts kits that Cabela's offer fit, or must I order from VTI. VTI wants $46 just for the hammer. This gun belonged to my grandfather, and is quite special to me, but I just want to get it back to functioning properly. The wife has stopped my spending until the economy eases a little, so I must keep the price down.