Thanks Duncan,next time you talk to Dave ask him if he has trouble keeping pressure up with wood.When you work them hard, the fireman is one busy lad firing with wood.I've found it quite hard to keep the pressure up with wood just wants to go so high then runs out of BTU's.Fella I know over here has a field marshal tractor one cyl. the one you start with a shotgun shell.German Lanz bulldogs are quite common.Frank C.