I bought this recently from eBay, and they are getting more and more expensive as they are now not available from their original source Graham Industries. I have added the flywheel, and the wet sump box under the base plate, plus the customised cylinder head covers, yes the 2mm allen screw bolt does look a bit strange, because I used the original cover screwed to the new cover for drilling. (As seen in the fore ground.) This was a good method as only 0.5mm from the six securing bolt holes to the edge of the cylinder. Handy for getting oil into the bores for storing. Regards,Gary.