advice on drilling out rear dropout adjuster bolt

[Plug1n]

As the title says

I have about 3-4mm of broken adjuster bolt (M3?) inside a rear dropout.

I've tried a 2mm drill bit on Dremel which made a slight indentation but looks like it would take days (literally).

As there are still a few mm of clear thread at the back of the dropout, it should be OK to destroy what is stuck inside and the touching threads.

How should I really be going about this?

[rogerzilla]

With difficulty, given the size.  If there is anything left to grab with molegrips, soak it in WD40 overnight and then try those.

If not, screwing a new, well lubricated M3 bolt into the hole might start it rotating, although you'll be lucky.  Drilling it is going to be extremely tricky, given the size. I had to drill out an M5 mudguard mounting hole last year and it is almost impossible to do it straight without a pillar drill and some way to hold the dropout perfectly aligned.

With a valuable frame, I would ignore it until next respray, then the framebuilder can do it.

[nuovo_record]

as above give it a good soaking and try to rotate it.
but if you're really not bothered about using it -leave it