Many problems
There have been many problems with the engine.
The rubber diaphram did not stretch enough to allow the crank to fully spin. As well, there was not enough space for the crank to fully turn because the displacer ran out of room to move up and down.

Furthermore, the peice of metal that secured the displacer rod in place has continualy been detached, and had to be re-glued.

Becuase of these set backs, with permission, the engine will be brought in as a non-working model to get marks for the process. Hopefully, a kit can be bought to make up for the lack of a working engine.