Went with a pupil to try out some violins for them last week at my local shop, when we we discussing various options one of the luthiers there pointed out that they were now fitting certain instruments with fine tune geared pegs.
I had not seen these before and was quite impressed! So easy to turn, you can do it with just two fingers, and the pegs can't slip
They had two different types, one looked just like normal pegs, the others a bit less so. I thought these would be great for anyone struggling with slipping pegs and general tuning issues. Might be worth people looking into them

I think these are a great idea pricey though last time i checked. you say the actual peg can't slip, but can you use them if necessary?

I really like them if they come with the instrument, but fitting them is awfully difficult and expensive. A real shame, as I'd hoped that I might be able to put them on my violin (it's far from a fine instrument!) but it's cost prohibitive.

From what I was told, fitting is easier than standard wooden pegs, not more difficult. The pegs themselves are the expensive part.
As for them not slipping, the shaft does not turn apart from a small section where the string hole is. The rest seemed to be fixed into the scroll.
Clearly for some instruments it will not be cost effective to fit, or have these pegs fitted. Perhaps I should have mentioned we were looking at violins around ?800.

I hope it is ok to post links
Pegs

Hi - the pegs look like a variation on the Perfection Pegs from Knilling http://www.knilling.com/ which have had some good feedback. So I guess they're installed in the same way - ie. glued in place, after the hole has been reamed to fit.

The Knilling ones were the other kind they had there, felt a little smoother to turn than the Wittner ones, but the Wittner were easier to turn.
Both kinds are fixed into the pegs holes, not sure if they are glued or screw in.

I would never ever have anything glued to my violin

Even if the pegs themselves do seem a good idea

After having been back to the shop I asked a bit more about these pegs. Neither make are glued into the scroll, the Wittner ones fit with splines and the Knilling ones have a thread to hold them.
Both kinds can easily be removed with no damage to the instrument, and standard wooden pegs can be fitted in their place should you ever want to do so.

Sorry I'm a bit late to this thread. I asked my luthier about these a while ago, because I have trouble with sticking pegs. After hearing a bit about them I didn't fancy them after all. It turns out that I might have ended up needing the peg holes re-bushed if I wanted to go back to ordinary pegs afterwards. It sounded like way too much faff, and I didn't like the idea of needlessly re-bushing my nice circa-1790 peg box. Instead I spent a few quid on the tried, tested and trusted peg paste.

Yes I have a similar issue - i like the idea of these pegs but my violin has a really ornate scroll... and the flowers etc. come right up to the peg hole, so wouldnt really like anything done to the peg holes!