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good gear box no motor, very clean nice blue cylinder walls and there's no air port on the side of the piston I think its good because the gear box is not air tight so could be bad or good? gears are very strong and 6mm gb but the the motor mount connection is threded so you might have to drill not that hard unless your a non tool use'n person plastic spring gide pardon my spelling but I dont see the use of metal unless you runing a high speed or m120'n up so no need and src shimed mine perfectly no woble!!!!!!! and its Tiwanes not chinese!!
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