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You need to mod one of the gear 'bushings' for lack of words to call it. it tends to break and then lets the gear slip. If it breaks before you reinforce it, build it up with JB Weld or a high temp epoxy to fill in the area that broke. Hard to explain but if I can dig mine out, I'll post a picture.
Also be careful not to use undersized BB's. I used BB's that were smaller than Bastards and 2 managed to get caught in one slot in the main gear. Since it's powered, it pulled the 2 BB's through after breaking one of the teeth. It has not worked since because it will continually jam.
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