The issues that i see happening are. The washers will start to get embedded into the wood and you will have to keep retightening the screws or bolts and after a while the issues will just end up returning. What i would suggest is you try to get the gear to work smooth with either just the front or rear screws tightened and then make a shim out of good quality plywood to fill the gap on the other mount to support the mounting flange on that side of the gear.