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

The 4158 compound is totally different - the eccentrics can be adjusted by a little screw.
The 4150 is a single cylinder with a slip eccentric that can not be adjusted - it has a fix
stop for forwards and backwards movement.

Here a picture of the adjustable 4158:

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Here a picture of the slip eccentric with the crank arm - that makes the forced control:

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