I agree with Delaware. when you push the cast switch the pinion retracts further into the gear side housing to "free float" the spool, and if the mechanism that controls that action isnt fully engaging then the spool pin my be clanking on the tip of the pinion gear. As far as the scratching goes, It could be the lip of the spool rubbing against the frame maybe from being knocked out of alignment by the spool shaft/pin clanking against the pinion gear.