I gotta tell ya this one Carl.Back in Feb.I bought what was supposed to be a "bored over PL5 cylinder with matching piston & rings".I put the piston on the conn rod without a problem,then the rings on the piston,then TRIED like hell to get the cylinder on.I worked at it for about 2 hrs.,then got pissed & put the goods in the corner.The next day I got the bright idea to measure the old & new pistons.I ended up getting screwed,the piston & cylinder were for a PL4 & the rings were for a PL5.I had another P:5 that had a dirty piston,but scored cylinder.I was able to clean up the piston & put that with the PL5 rings on the saw.I just need to clean up the original cylinder a bit & I'm good to go.So I won't be needing the PL4/SL4 cylinder,but thanks for your offer!