If its anything like my 28 "T" shaped handle, you should be able to carefully slide the brass/plated barrel off the handle stem. You may find two lock springs protruding. These can be depressed and with the key in the barrel it should pull out. If you don't have a key any 90 degree pick should pull the barrel. As to the pins or tumblers, I believe mine had seven but, my memmory is fuzzy. Above all go slowly, and if its stuck, (as the sometime swell the pot metal) get professional help. It worked for me.