My Frankenstein stopped working and I found the longer shaft on the motor that spins the four gears broke.
This is the shaft that's broke.

I found what appeared to the be the right part on Planetary Pinball, ordered, received and appears to be wrong.
I did the same thing at Ministry of Pinball and Australia spare parts and they all come the same but appear to be wrong.
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Here is what I'm recieving.

One end is square so it doesn't fit in the round hole or the round gear.
One gear is square for it to fit but the other is round as is the housing on both sides where the shaft is supposed to fit.

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Can anyone point me in the right direction?

Sorry about that. I should have put that in the first post.
Part #02-5443 Monster Mech. Assembly Drive Shaft

That appears visually to be wrong also or am I looking at it wrong?
The broken shaft is round on one end and square on the other
That one looks to be square one both ends also like the others I've bought.
I'll order it and give it a try.
Thanks.

Contacted PPS and the picture on the website is right but the part is wrong.
They are looking into it.
Marco says they have not been able to get that part since 2014.
Looks like I'll try to get a machinist to make a batch of them for others that may need them also.
Unless anyone else knows a place to get one.
Thanks.

I'd like to buy 2 or 3 from you please.
I missed that and in your post.

Thank you sir!