Hi Ken, Just started a Acorn USA Tank and come to all the linkages. The big teardrop crank nearest the cab, it it supposed to be drilled through and free moving or left blind and affixed to the piston driving crank?
Badger, I assume you are referring to the return crank on the rear axle. If you are, then this crank is fixed solid to the crank pin bush set at a 10 degree angle. If you whatch the video oof the chassis on my WB thread then it will show how all the valeve interacts.