The latest replacement head gasket on my old Kellogg-American TVS201 2 cylinder air compressor blew out again at the narrow place between the cylinders last night. I'm thinking of making a new one with smaller holes to match the valve recesses instead of copying the old one which was cut out to the cylinder bore size. The pistons do not quite reach the top of the cylinders when turned by hand, and to check free play I could run it with a pencil lying across the open cylinders. If the pencil doesn't fly off then the pistons shouldn't hit my new gasket. Anyone else have experience with this?