From the video provided I can see that the motor WILL fit in the mount. It just takes a bit of perseverance and maybe some sanding like jzrf6c says........
Did you try using some calipers to see if the OD of the motor can and the ID of the mount are close? I have probably 6 of these lil bell motors with the same mount and have even gone so far on one of them to use a drill and "clean up" the inside of the mount. That is so close to fitting (you did have it partially inserted) the mount just needs to be worked a little. Don't give up man! Part of this hobby includes being a true Stone Age Technology expert. If ya ain't got the proper tools........use the tools ya have at hand.


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Of all the things I ever lost....................................... I miss my mind the most!