I have a 30 which only was equipped with one spring, not two...the motors are otherwise identical.
Whatever you do, DON'T unsolder ANYTHING! I must yell in ALL CAPS like I'm on REDDIT because otherwise one might make a mistake...and the last two mistakes I made changing out Edison springs weren't pretty. One propelled a castiron barrel into the garden where the gear sawed halfway into a watermelon. The other one (I was sitting on the porch of the barn working on it) burst out of the barrel with a one-way ticket to Ballsville, USA. I walked funny for a while after that one.
That said, Edison machines are relatively simple. I think the Amberola is a nicer mechanical design than the early belt-drive models.
Try checking the ends of the barrel to see how your covers are attached. Maybe someone else with more experience on the 50 model will come along. Good luck on your restoration--it's a lot simpler than you probably think it is, which should be a big relief. Makes it easier to play music!
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