My 2nd stage adjustment tool fit the seat holder just fine when I rebuilt a Calypso IV; however, it does not fit the seat holder when rebuilding a Conshelf XII. I thought all 1085 metal second stages were the same? No? Is there another 4-slot tool with larger slots or is my only solution to file/grind so the slots are larger, or just replace the seat holder with one that fits? Thanks. Mark.