check the spin of the ratchet with the wipers removed. Hold in the reset coil plunger to ensure the pawls are lifted off the ratchet teeth, then turn the shaft and release. If it's not moving freely, then the usual problem is dried grease/crud in the hole thru the metal frame. You can also remove the return spring around the shaft and check that you can spin the ratchet freely in both directions.

if all else fails, it is slightly possible the hole in the metal frame got damaged ... who knows how. I've only seen it once, and the solution was to swap in a frame from a parts machine. Also once had a ratchet that was swollen/distorted and swapped in one from a parts game, but you've eliminated that. Needed to cut a new flat spot on the replacement ratchet to prevent unit from physically overstepping.

there's no need to lubricate any plastic on metal interface. It will eventually gum up and cause problems.