There are supposed to be 18 needles, all the same size. If you have four larger ones then
someone got them mixed up. Here is the gear with the needles loaded with the retainer in
place.
http://www.pbase.com/dennygraham/image/137529544
This shows the main shaft assembly and the order that it goes together.
http://www.pbase.com/dennygraham/image/137530309
Here are all of the pictures of my SM420 assembly.
http://www.pbase.com/dennygraham/sm420_rebuild&page=all
Denny Graham
Sandwich, IL


Denny G
Sandwich, IL