Ran into the first time I couldn't fit my Chuff-Generator on the motor in the standard mounting. The clearance around the motor in this Williams brass Pacific is just too close to allow it to fit. Fortunately, last year I was thinking about a situation like this and made a little board that just has the flywheel sensor to make things smaller. I could fit my mini-sensor board under the driveshaft and just mount the Chuff-Generator remotely. First time I've had occasion to use the little board, but now I'm glad I thought of it back then.