Folks,
I stopped in at the PO tonight on a chance that he might remember the adjusting knob. Yep, he dug around in the garage and in less than a minute I had it in hand. Looks like it has some weld in a area that must have worn?
Still not sure how this works

I did notice that the exhaust pipe has rusted through on the top of the small pipe extension beyond the muffler
I also got the serial number, any info on that would be good. Sorry I did not look it up yet. The PO said this 86 was purchased in 1976.
2050042U485955*
Hope things are good in Cub land!
Regards,
Chris
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Casbohm Maple and Honey
www.mapleandhoney.com
Cubs: 147
R and the "train", 127 elec lift, 127, 125, 106, 102, 100, 86, 73, Brinly plow, Snow thrower, 2 Rototillers, several mower decks and several snow plows, #1 cart, Grandkids barrel cart.