RE: retiming ? on GWS EPS-350C-DX
The GWS 300 and 350 gear drives use motors that are setup for direct drive (improperly timed). Both should be retimed to improve peformance and increase brush life. A quick way is to use a new pair of small needle nose (sharp teeth on jaws) and grab the rear bearing housing rotating it against the motors rotation, 3/16 is usually enough.
Mike