I think the R107 used bolts like that to fix the set into the case. (Including a very long one that went from front to rear and had a tendency to shear off.)
(I can't get at my R107 to check at the moment, but I'm fairly sure they were thin headed bolts with screwdriver slots - presumably so the operator didn't need a spanner to change the valves, fuses, or vibrator.)
Chris.
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