My 5.5 ohv briggs is running fine but I went to grease the clutch bushing and noticed some end play on the crankshaft it is pretty noticeable and is the clunking noise I hear from time to time! I dont generally open small engine cases but need to start! I can't afford shop rates in this economy! Can I just open the case on the shaft side and shim the thing? Or do I have to go further into the engine? Any help would be great! Thanks in advance!