I recently bought a used ms441c which is in strip down mode for cleaning and inspection.... but don't know the year because the tag was ripped off how do I find out what year it is? -Can I buy a compression tester ? which one? and what should my compression be for this saw? -I need to remove the clutch to clean up everything. do I stick a thick cloth or rope in the piston area from the exhaust to lock it up then unbolt the clutch to get it off? What is my torque spec to put it back on? -I have a heavy duty air filter I believe, should I clean it or get a new one? Also the rubber band cloth thing that going around the air filter should i clean or replace? -What is a good way to buff or clean up the muffler without scratching it ? -What is a good way to clean up the orange and white plastic pieces, also restoring the shine? -What type of paint should I use on the magnesium parts?