Branson 8050, IH 574, Oliver 1550 Diesel Utility (traded in on Branson) NH 8160. Kioti CK2620SECH
The stop could be the roll pin, you may have to screw it back in far enough to get the roll pin out thru the holes the plugs covered.
If you can't turn it in far enough because of it being bent,
can you cut it off and slot the cut end to screw it down in further.