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I think the bevels should be a non-issue. As stated above, alot of guys that had the pull-in from the rear type starter drive have gone to the gear reduction push-in from the front type and experienced no problems.
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The gear reduction type of starter works slightly differently than the inertial type. On the inertial type, the starter starts spinning, which pulls the bendix into the ring gear. If there isn't a decent bevel the bendix gear and the ring gear are not going to mesh, and the system will lock it self up. What is supposed to happen is that the inertia keeps the bendix from spinning until it slides into the ring gear, and the the inerta that the starter motor has developed since it is going quickly, and the armature is fairly heavy will turn over the engine. Of course, if the bendix is greased or oild be a DPO, or bad mechanic, the the bendix will become very sticky, and start to spin before it contacts the ring gear. Sir Lucas knew this so he added the flats on the end of the starter to release the starter when this happens. So nice of him!
The Gear reduction uses a big soleniod to pull in the bendix, which is NOT attached to a spinning motor, so the bevel mating is not quite as critical. In any case, even if the bendix didn't match up, the starter motor would only start when it the soleniod (and gear)is all the way in.
Yisrael