From new they dont have this setup like 99% of the other watercooled engines, they use a 3 piece head gasket riveted together. This is likely to leak a lot of the time and also results in the engines squish band being a massive 1mm or so.
Its possible to drill out the rivets and split the head gaskets into thinner parts, however its not a very elegant solution and can still leak.
By machining some o ring grooves into the barrel its possible to use any kind of head on the barrel as well as reducing the possibility of leaks.
Anyway, first job is to make a jig to hold the barrel so it can be mounted in the lathe. This plastic makes for a nice quick way to make jigs (its actually an industrial chopping board - so its nylon). lathed down so the barrel skirt fits into the center snuggly and the outside is held by the 3 jaw chuck. The 4 m6 bolts are counterbored into the jig to clear the chuck jaws.
To begin with i used a threading tool to ensure the grooves where in the right position, then switched over to a 1/16th inch wide parting tool to finish the job. it came out really well! bit hard to see in this photo because of the flash.
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