64 rowe ami tropicana rectifier mod.

[Santucky619]

Hello all thanks in advance for your help. I just got my first juke. A 64 rowe ami tropicana. It wasn't working but after a thorough cleaning and some adjustments. It works and sounds pretty darn good..
My question is: after it sits unused a couple of days. It seems like the search unit struggles to turn. I lightly oiled the armature and it seems to maybe have fixed it. I would also like to replace the selenium rectifier. It has 3 wires. 2 yellow and a red. If I update it with a 4 prong silicone. I have heard I might need to add a slow blow fuse. That is fine, do I add it inline with the red + wire? 2 or 2.5 fuse? In addition should I also ground this. The main power cord is a 2 prong cord. Is this machine not grounded?. Again thanks for all help and advice. I will enjoy this forum
Kenny