Got a lathe ? Have a go at making one or two. Its what our hobby is all about.
BobH

Baty dial gauges have M2.5 threads – only a guess, but these may be industry standard.

Whole bunch of contact tips here:-

https://www.bowersgroup.co.uk/contact-points.html

Edited By Mick B1 on 08/10/2017 21:06:16

I’ll have a look in my shed shortly. I possibly have a few spares too.

I don't have a "John Bull" indicator, so I am not familiar with the instrument. I am assuming the missing pointer has a male thread. If so, try using something like a toothpick and screw it into the female socket. You might just get a thread pitch and an OD from this test. Good luck!

Good lad, well said!

Tony

Yes, sorry if I stated the obvious. I have noted that you don't accept ideas easily when alternatives are suggested. 'Warpage' comes to mine vey recently.

I consider all the alternatives available to me before posting Some don't. Most of my stuff is second hand and I have a large range of odd bolts and screws, but not taps in all sizes. I would be checking my other dial tips (yes, i have several old ones picked up over decades), or other small screws, to determine the thread. There are not that many in that size range. Speedy builder5 likely wrankled as well, but never mind, I will just chuckle next time I read your posts.

I have two John Bull indicators, both acquired recently, and both imperial. One is without its tip. A 6BA screw goes into both perfectly. Hugh.

Pleasure to help