ok heres what happened.

I went to these guys Marples Gears - Precision manufacturing . they could make them but it would be too expensive. some comments from the guy (who gave us a tour of the place)

1. he measured how much carbon was on the gears and commented that it was just a bit too much, making them too brittle. he recommended I buy the gearbox again but place the gears in the oven at 400 degrees for 2-2.5 hours. in order to make them better suited for the task.

2. he also mentioned that these gears where made with an older model machine and that it takes longer to make in those machines, and because of that process its not as strong because its under heat for a longer time.

Note: he showed me his machines and I just found out that the grubee gearbox uses those same machines for their gears.

well, I just could not find these little bastards

oh and I dont need the new chain, because I ground down the sprocket, had I known I would have loved to try that chain.