My reactor was acting up in that the arm was getting stuck and I would have to give it a little nudge to get moving. It was a pretty consistent getting stuck as it moved. After taking the gear box apart, I confirmed what others have stated. The one gear was split which drives the arm. Others have reported that they went to NorthWest Short Lines to get a replacement gear. NWSL was not back up to order the gear so I found an exact replacement on Ebay from a Chinese vendor. The gear was an exact match for the original and pressed on perfectly. Following what others stated the gear to be helped me find it on ebay - 0.5Mod 10T, inner diameter: 1.95mm; Tooth length: 5mm; round diameter: 6mm. Others stated the bore was actually 2 mm but this was close enough. For less than $5 shipped I got a pack of 10 gears. I did not need a new belt as mine was still in great shape. After putting it back together I also noticed some binding on the door that opens and closes to release the plastic pellets. What I found is if you loosen the screw which attaches the connecting rod to the door, it allows the rod to flex properly and not bind. The door now opens perfectly smooth and also smoothed out the entire movement since it removed some binding. Its now back together running better than ever. If anyone else has a split gear, check ebay for the replacement gear. Its a perfect fit.
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