What I did say...
'Bugger that, just put a flat and a spring washer and an ordinary nut on it, sod struggling like hell with a nyloc'
Big bolt (10mm) with a slotted head, going into a nyloc nut...that's really quite hard to use a screwdriver with enough force to drive the threads into the nylon...anyone would struggle..and there's quite a few to do.
What i'd like to have said was...
''Bugger that, just put a flat and a spring washer and an ordinary nut on it, sod struggling like hell with a nyloc....and its a shame you couldn't work that out for yourself, you've been doing the job for 2 years, its basic bud, really basic problem solving'