Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Bonjour Doug,
Why would we need to change the one we have on our M91 engine ? Personnally, I do not touch anything so I should not damage it.
10 is a great figure and I do not know 10 friends who have this engine

Since the M91 comes with these already, i assume Doug was referring to the M90, which comes with a less slick solution.
As far as the number goes, i agree completely, 10 is overkill for most of us