Originally Posted by tartanss
thanks for the advice----they are aluminium and probably have corroded with the stainless so lots or wd40 and will try some more--- am currently working in Mackay north of Brisbane Aus at the moment so will attack the job again next week--- would heating the locking nut with a small gas torch help to free it thanks Rob
I would think a penetrating oil would work fine on its own. We use PB Blaster for iron-based alloys/steel/etc. For bronze-to-bronze things (like rigging screws) we use a thinned lanolin oil, though. Aluminum often "welds" itself nicely to things and thus you might find that heat is useful if the penetrating oil by itself just doesn't do the trick.