Been hopping through fields and woods today.
Inspection at home: found a bolt missing from the frame. M10
Have M10, nylon hex lock. Wouldn't fit.
Went out to buy M10 regular. Wouldn't fit.
Realized I had a M10 from the bike cannibalized on another job. That one would fit. Problem solved.
Difference isn't much, but fitting our M10 would require rethreading (that's why I had an original one left over), which isn't something to do at the roadside nor a quick fix as simply fitting a new bolt.
Here is the question:
Why do our M10 bolts not fit on Indian M10 thread?