Quoted from CaptainNeo:I would think the shaft could be slide up and down like a flipper bat. No? Isn't it set with just a set screw?
No - I just had mine apart. The only way you could raise it is by adding a washer to the shaft underneath the cannon. And it would have to be a thin washer because there is a circlip below the bearing and if the shaft is held up too far by the extra washer, the circlip will not fit back on the shaft. The set screw holds the linkage on the shaft. It does nothing to set the height of the cannon.