I have ordered the new GP 07 after looking at the parts listing,, they show a head and a combustion chamber thus 2 parts I would guess a combustion chamber is the glow insert for the plug. As soon as I get it its going to Davis he thinks a diesel insert can be done with the thumb screw and spring ala the OS 10 and should be inexpensive $20 ?? this engine has both beam and radial mount
features nice for small stuff, no engine mount beams, just bolt to the firewall and its only 3 oz martin

WARNING this the the new one GP 07 do not buy the old one if you are thinking about this , I will report back if this all cones together
test run and let you guys know how it does