I recently purchased a QA 36A snow thrower attachment for my narrow frame model 123. It is supposed to fit both narrow and wide frames. Once I brought it home I realized that it did not fit my tractor. There is a peg on the snow thrower bracket where there should be a hole to fit mine. I did a little bit of research and I found out that my serial number is too low. I was wondering if drilling out this peg will fix my problems. Are there any other variables that I am not considering? Does it make more sense to sell it and try to find a normal QA snow thrower that fits narrow frames? Any help would be very much appreciated.