I recently bought an OTC # 5609 to replace one that went missing. I like it 'cause it has a whole range of plug adapt. incl. 10 MM. Kinda cheesy in that it uses an aluminim panel to cover the plumbing, I thought it was an aluminum block, but it works great. The pics in the amazon link will show what I'm talkin about.
You should block or hold the flywheel/crank, 'cause on a lot of motors ya gotta bring the piston past
TDC to get by the ACR.