My Taigen PzIVF2 that is from the same time frame came with zinc geared 3 shaft transmissions. If that is what you have, compare the diameter of the screw hole in the plastic drive sprocket with the screw hole in the metal sprocket. You will probably find that the hole in the metal one is larger. This is because the metal sprockets are designed to fit on Taigen transmissions and not the Henglong transmissions that your tank has. You can use a flat washer paced between the sprocket and the lock washer to overcome the size mismatch. Or you can go through the added expense of buying steel geared transmissions from Taigen and they will come with the required screws.
The bearings that Shaun is talking about are add-ons that fit on the hull and add support to the shafts.
Last edited by Dusty Steppes; 02-10-2018 at 01:16 PM.