Tecumseh HH 100 JD Lawnmower engine??

[TWISTER]

I am rebuilding a HH100 Tecumseh engine and would like to know if anyone has had any luck witn sleaving this engine back to a stock bore size? Its already .030 over and I cant find a piston for .040 over as Tecuseh stopped making them past .020. Soo I can either sleave it or put the .030 back in and hope for the best till something comes along. The machine shop has sleaved a Kohler engine this size before but as soon as it got hot it split the block because it was too thin. I cant find anyone who makes a piston for this so any help is appreciated TIA Marty