When you open the gear box I would look at the ware on the shims and bushing. and if there was grease between the shim and the bushing. if it was to tight there will not be a spec of grease and the bushing will have a shine to it like it was polished. The last time I did my shim I shimed and then left the spring out full reassembled and moved the gears by hand to check they moved freely.
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