A cheap and easy fix is to go to your local chemist and buy a roll of
micropore tape, and edge the eye pieces with this.
It's easily removed, doesn't leave any residue, is
definitely hypoallergenic, and will solve the problem for pennies.
Dunno if I'd recommend the shrink-fit solution (no offence, Andrew), because waterproof or not, I can see no good coming from inflicting expensive bins to steam for a kettle, even for a short period!
Also, if the eyepieces are of soft rubber, they will in all likelihood distort as the shrink-fit contracts. I've used the same stuff to reinforce rod sections (I build and repair rods on occasion) and it
does tighten up pretty significantly against the blank, so I'm pretty certain it could "mangle" the eyepieces...
Actually, I've just tested that theory - sad, eh? - and the eyepiece is OK, but trimming the shrink wrap such that it covers the very edge of the eyepiece without being an irritant in its own right, is beyond me. Plus, it makes the soft rubber uncomfortably hard, because the shrink tube goes very stiff when it cools.