Originally posted by RichJohnson
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The Hooben track has different pitch than the HL track and needs the Hooben sprocket to work properly. The Hooben spindle is a double D shape, so is the Hooben sprocket hole. It is not difficult, but tedious to make the nylon sprocket hole single D to match the Heng Xin drivebox axle. I used a 4 volts rotatory tool and some small files for the job. I worked slowly to assure a slug fit.



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