By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Mystery Tool.

All Topics | Latest Posts

Search for:  in Thread Title in  
Lathejack02/04/2020 12:46:02
277 forum posts
334 photos

Can anyone guess what this little tool is used for?

It's actually a tool I made myself a few days ago, it's machined from a piece of 3/4x1/2 inch key steel. The threaded screw is a high tensile M5 capscrew with a knurled bronze thumb wheel added. The end of the screw is machined to form a tiny pin 2.5 mm long by 0.7 mm diameter.


AdrianR02/04/2020 12:49:54
432 forum posts
23 photos

Pure guess, it is to remove clock hands

John Paton 102/04/2020 13:17:10
268 forum posts
17 photos

I have a very similar tool but plier action, which is for punching holes through steel tape measures to fit joining strips where the tape has snapped. Never seen one of these before or since I picked it up - we now live in a throwaway age! (and yes I have used it, on a 30m tape and it works well. My son reckons I am a dinosaur)

Mick B102/04/2020 13:34:33
1545 forum posts
83 photos

I reckon it's for punching back the solidified plug of superglue in one o' them tiddy little bottles, only you need a longer pin. I tend to use a 0,75mm drill in a pin vice. Then I have to scrape out the glue from the flutes under magnification with the sharpened end of a rattail swiss file before I can use it again...


John Haine02/04/2020 13:42:41
3009 forum posts
160 photos
Posted by AdrianR on 02/04/2020 12:49:54:

Pure guess, it is to remove clock hands


V8Eng02/04/2020 13:45:14
1405 forum posts
27 photos

To push the pins out of Watch bracelets?

Grenville Hunt02/04/2020 14:28:34
14 forum posts

I have an identical one for removing the pointers from pressure gauges!

mechman4802/04/2020 14:33:42
2627 forum posts
407 photos
Posted by Grenville Hunt on 02/04/2020 14:28:34:

I have an identical one for removing the pointers from pressure gauges!

+1 & for pointers of watches


Lathejack02/04/2020 19:32:10
277 forum posts
334 photos

Adrian was there pretty quick, followed by a few others. I made this tool specifically for removing the needles on some Smiths speedo and tacho guages for my 1971 BSA 250ss Goldstar.


Edited By Lathejack on 02/04/2020 19:33:35

Neil Wyatt02/04/2020 19:50:08
17712 forum posts
697 photos
77 articles

I was going to suggest it's an ear-piercing device for people who enjoy long-drawn out misery instead of a short sharp shock...


Hopper03/04/2020 02:57:58
4389 forum posts
92 photos

12,000 rpm on a BSA single-banger?

Now THAT'S optimism!

Lovely job on the extractor tool though.

Edited By Hopper on 03/04/2020 02:58:48

John Olsen03/04/2020 03:48:28
1028 forum posts
86 photos
1 articles

12000 would be a bit optimistic but they would do about 8500 or so. I had the Triumph badged version of the same thing, eg a Blazer 250. The original Smiths speedo didn't need a magic gadget to pull the needle off, it fell off inside the glass while I was riding along one day. I managed to find a chronometric to replace it, which allowed the fun trick of locking the back wheel for a moment as you stop to leave the speedo reading about 10mph or so, really confusing for bystanders. Mine was the street version, with the big front brake but still had the breadbox high muffler until I put a Dunstall Decibel on. I suspect mine was the only one of that model in the country. (NZ) It may well have been brought in for the show model just before they went bust and stopped making the 250 sizes. I did see an off road version many years later with the small front brake, but that had been brought in from the USA.


mark costello 103/04/2020 17:57:40
583 forum posts
12 photos

Can We see the tool to put the needle back on?

Michael Gilligan03/04/2020 18:13:47
15455 forum posts
668 photos
Posted by mark costello 1 on 03/04/2020 17:57:40:

Can We see the tool to put the needle back on?



Edited By Michael Gilligan on 03/04/2020 18:18:06

AdrianR03/04/2020 18:16:58
432 forum posts
23 photos

Ha! Snap!


Michael Gilligan03/04/2020 18:19:01
15455 forum posts
668 photos


Lathejack03/04/2020 18:27:01
277 forum posts
334 photos

Yes, you have to question BSA's logic in fitting a 12000 RPM Tacho, and without a redline, onto the relatively fragile B25 engined bikes.

This Tacho and its matching Speedo are the 60 mm diameter type that were also designed for the BSA Fury & Triumph Bandit DOHC 350 twins, they were also fitted to some Ducati singles. There are still plenty of these NOS Tachos about, but the matching Speedo is harder to come by. The Speedo I have just bought only shows 6700 miles but has an alarming amount of wear around the spindle, allowing the needle to slop about all over the place, although the rest of the internals are in excellent condition. The only reason I dismantled the perfectly working Tacho was just to see how the needle spindle was supported, so I could then attempt to repair the Speedo.

I also have the 1971 Victor Trail version, this is a standard and totally factory original example showing less than 1700 miles, a really great bike to own and ride.

1971 BSA Victor 250.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Allendale Electronics
Eccentric July 5 2018
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest