Slippy seat post (but not the usual kind of slippy)

That reminds me.. I ordered some of this shit ages ago and still don't have it.. along with an allen key set.. fucking fuckers!>

Or maybe I do have this but it's buried under a pile of junk in the cupboard of infinite bike shit..

Go to it . . . use it . . . it is your friend.

It is designed for Carbon parts (which has a low friction coefficient) - but works just as well on metals/plastics.

Not only does it stop stuff from slipping, but when you come to taking stuff off/apart it magically acts like grease and helps stuff come apart easily.

I know that sounds contradictory - but it works like this, it is made from millions of tiny rubbery spheres - when under pressure, when the part is clamped down, these spheres squash and deform to form a dense paste with a very high friction coefficient - but when you loosen up the part for removal the spheres return to their original spherical shape and help to 'roll' the surfaces away from each other.

You only need to use a very thin layer, so a tub like the one above should last many years.