Its pretty easy to remove - and that was the underlying problem of when I refurbed my starter. For about 5 minutes work and the cost of 20p - it definately isn't something I would bother skimping on!


Go and buy a pack of screw type stud extractors, stick it in the hole and gently twist. It will bite into the soft copper ring and you'll be able to just either drag it out, or turn the stud extractor far enough that the copper falls apart and subsequently falls out.
If I had a tap large enough, I would have used that to bite a thread into the copper and pull it out.
The fella in the starter shop was under the impression you could stick a screwdriver in there and flick it out - mine was way to tight for that.
Fitting it was easy, a long 13mm bolt, thread a nut and washer halfway up, slip the ring over the end then tap in with a hammer, wind the nut down a bit with each hit
