The 4 spring M20 adapter I got from Kidderminster also had the clutch stick out too far by a small amount. This was because the adapter was stopping on the shoulder of the main shaft before the taper fully engaged. It felt OK putting it together until you noticed that the adapter could be removed by hand once the main shaft nut was off.
Tighten the main shaft nut and see if the taper locks solid. If not you have the same problem as me. About .020" needed to be removed from the adapter before the taper fit and the sprockets were in alignment.
Thinking I received the wrong part, a friend with Goldstars gave me a 4 spring B series adapter to compare and it was definitely different to what I have. With the B series adapter the clutch was too far out at least 1/4". But the taper did lock properly.
So I am thinking I have the correct part but not made correctly???
My M21 is running now with the 4 spring and has a clutch that actually works!
Bruce I did note your comments about this originally.
Even with my adapter just nipped up without the woodruff key, I still had to use a puller to remove it, and measuring the thread also confirmed that it's fully home. Obviously some variation in these parts :confused: Ron
