I usually break to old ring in two & use the broken edge to clean the piston lands, clean the carbon out at the bottom of the land. Check the ring end gap by putting the new ring in the sleeve & align with bottom of the piston , check gap ,1 to 2 thousands. Most Dykes rings are pinned so they don't rotate & catch the ring end in a port , don't put the pin anywhere but at gap or you will break the ring when you put piston in sleeve. I clean the sleeve & piston with the finest Scotch -Brite . Wash the whole works with hot soapy water & spray with carb cleaner. I have always used medical castor oil when I assemble an engine . MAX H.