grumpus

Steel fastener in aluminium frame will likely cause galvanic corrosion over time, particularly if it gets salty from road salt or sweat or spilled electrolyte replacement beverage, so it's a good idea to use a dielectric grease to prevent moisture ingress and reduce chance of seizing. I often use copper loaded grease on my stuff, technically that's a bad idea from an electrolytic point of view - it does seem to help prevent galling, which stainless is prone to suffer. If you replace your (presumably) stainless screws with anodised aluminium fasteners you'll eliminate galvanic corrosion, but they're more inclined to be damaged by a hex wrench - Torx heads are better for this, still use grease.