This steel counter shaft adapter allows the XT225 engine to be used in the TW200.  Hardened steel.  Zinc plated.  Uses TW200 front sprocket.  Our first run of these has taught us that it is difficult to fit new tight tolerance parts to old worn shafts. The first run ended up being a few thousanths tight on the adapter bore on the outer spline. (As pointed to in the picture) It needs some filing to be able to fit on the XT225 shaft. Our loss is your gain. (If you made a purchase for one of these first revisions at regular price, you will get a new one ASAP)