I have some prop movement on the shaft in and out. Has always been there. Checked on some other setups and there is no movement. Motor is a 88 200XP. When I bought this boat, it had an aftermarket prop lock installed. The lock nut is tight and the pin alignment is good. Is a little slop acceptable? Should I add a washer / spacer to gain a little more thread to hold the prop down tight on the thrust bushing? The play is about a 1/32". Thanks for any help.