M103 valve stem seal replacement
 

Gotta replace those seals in my efforts to make sure I pass emissions; car has 166k on the originals and the engine seems to inexplicably use oil whenever it feels like it; a little here, a little there, usually in the final miles before an oil change. Seals are cheap, might as well.

I plan to use the Autozone loaner spring compressor, but I need the spark plug hole air nozzle tool to keep the valves in place during the process. Does anyone know what the thread dimensions of the spark plugs are? Has anyone made a tool for this, if so how & using what? Thanks for all inputs