Hugh,
When I got my 1650 the previous owner handed me a box of torn up parts that used to be the pto clutch.
The coil and mounting bracket were fine, but the armature (the part with the 1/2" sheeve on it) was destroyed.
I started looking around at my options and found that there are a few clutches that use a 5/8" sheeve on the
armature that would fit for replacement. I don't remember the tractor models now, and I came up with a different
solution due to the cost of a replacement clutch.
I have an armature from a 782 that is in need of a new bearing. I plan to replace the 1 1/8" bearing that is
seized up with a bearing that will fit the 1" shaft on the 1650.
I already have a spare mule drive from a 782 and the proper pulleys for my tiller and snow thrower
so I'll be able to use the same implements on my 782 and 1650 with only minor adjustments.
I haven't gone into the bearing supply store to get the replacement bearing since the tractor is still torn down for a referb,
but I'll post pics and part numbers when I get that far.