Paging them wot knows about bolts - again.

The combination of stainless steel (bolt), alloy (case) and copper (grease)
can set-up an electrolytic effect that causes corrosion and it's normally
the case that suffers most.

This is the stuff to use with stainless
http://www.mandp.co.uk/productInfo.aspx?catRef=520256

 

I thought it'd be something like that, but I've never noticed it
happening - presumably because I'm looking at the SS bolt, not the alloy
case.

Cheers. Come to think of it, whenever I've replaced any bolts with
stainless, I think I've always used threadlock. Something to try to
remember in future, though.

 

Threadlock's also fine, just choose the right one, depending how likely you
are to need to take it apart in the future.
See http://www.loctite.com/int_henkel/loctite_uk/ Loctite also an
aluminium-base anti-seize, same page.

 

Well, Halfords only do one kind of threadlock. (Although, for some
reason I can't quite fathom, I appear to have three half-used bottles of
it.)

Loctite in a stick! Cool!

 

I think they get thrown into the bottom of the toolbox, slip through the
vortex in the bottom, go off for a little holiday with the biros and the
odd socks (during which time I have to buy another one), then reappear
on the workbench at a later date.

It's stopped happening know I've started storing them in the door of the
wall cabinet - they can't get to the vortex from there.