In reply to Will Legon:
I just prize them out with something stiff and pointed.
Incidentally I don't have any use for strimmer (plastic) "cord" or whatever the term is. I simply use wire. And once done it's not, as Chris' article implies, just a temporary emergency measure - it's fixed. For good as far as I can tell. I've been doing 'em for myself and pals for years; lasts longer than the original but I don't yet know how long as these fixes have yet to fail. The only slight downside I know of is that the wire, not being as flexible as the original, can become a little bent when being carried in your rucksack. However it's a simple matter to straighten it again. This is most noticeable with bigger cams, say 3.5 upwards.
I had to experiment a bit with the wire I bought; my first choice very thin flexible wire proved too flimsy and broke. The stuff I then bought, from a local hardware store, is about the same diameter as the rigid wire on Technical Friends and Camalots.
Good luck with it. With a bit of practice you can do 'em in about 10 mins and Bob's yer uncle.
