perhaps a keeper pin on the main spring over the track frame---check yours to make sure there in.
[attachment=43561]IMG_0756.JPG[/attachment]
Hopefully picture is attached..
If it's not one of the two main spring keepers, then also check the main engine air intake supports on the back of the pony
Neil, believe you got it with the intake stand-off.
If so, best be looking for the broken/ missing stud also.
Does look like a track master pin and yes, early versions were hollow and used the tapered end plugs.
It might be just a metal bit that has nothing to do with your tractor except proximity.
Hit it with a file to see if it's hardened.
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