you'd be best to research (on here, as I know it's here someplace!) re those brass nuts...
I did all my studs and nuts (remembering some have studs and nuts and a couple have bolts - your coice what you replace with but some are easier to access than others) and the most important discovery I made was that (poss Brickwerks??) a particular company supplies a 'downsized' nut (iirc it was 1mm spanner size smaller than the usuals?) which made doing em up a heck of a lot easier (and therefore undoing em in later years!).
IIRC Kev the Rev recommended actually replacing these fittings as a matter of servicing every 2-3yrs... Oh, and a liberal dose of Copperslip too!
