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07-16-2015, 07:24 PM   #1
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Fixing 2 old lenses

Hi,

I bought a Pentax Spotmatic SLR and was going to start shooting with it. I also have some m42 lenses to shoot with it, But a couple of them (non Pentax) have some screws that the threads have been worn. Now to replace hard to find screws that are very small (unfortunately they are not common Pentax makes) what is my best bet? I checked ebay to look for repair-as is models to use for the parts but they are not common.

I attached a picture.

Would anyone recommend going to a watchmaker? Do any of the camera manufacturers themselves keep extra screws from the years of their production?

Any insight would be appreciated.


Thanks!

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07-16-2015, 09:35 PM   #2
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They both look like set screws though the one on the right also looks like may have the head broken off.
The one on the left looks like a dog point set screw. Get a micrometer or calipers and measure the outside diameter. The look up the size on a screw chart. Usually the threads cant wear down smaller than the root diameter. You should be able to get close.

I want to bet those are metric.

Also measure the lenghts to see if you can find something that looks like that size.
07-17-2015, 03:29 AM   #3
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Micro Fasteners
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07-17-2015, 06:56 AM   #4
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Lens screws are generally smaller than m2, which is the smallest micro-fasteners carries, and micro-tools doesn't carry small set screws at all.

The best source I've found is simply cannibalizing other lenses.




Last edited by dcshooter; 07-17-2015 at 06:56 AM. Reason: typos
07-17-2015, 09:07 AM   #5
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M1 smallest - will do custom - inquire about costs and minimums

We specialize in very small micro setscrews (mini set screws) from M1 to M3.

If you just need a couple screws for a one off repair - ask for free samples.
07-18-2015, 12:05 PM   #6
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QuoteOriginally posted by BlakeShellman Quote
They both look like set screws though the one on the right also looks like may have the head broken off.
The one on the left looks like a dog point set screw. Get a micrometer or calipers and measure the outside diameter. The look up the size on a screw chart. Usually the threads cant wear down smaller than the root diameter. You should be able to get close.

I want to bet those are metric.

Also measure the lenghts to see if you can find something that looks like that size.
Thanks!

---------- Post added 07-18-15 at 11:07 AM ----------

thanks!

---------- Post added 07-18-15 at 11:08 AM ----------

QuoteOriginally posted by dcshooter Quote
Lens screws are generally smaller than m2, which is the smallest micro-fasteners carries, and micro-tools doesn't carry small set screws at all.

The best source I've found is simply cannibalizing other lenses.
good info!

---------- Post added 07-18-15 at 11:31 AM ----------

QuoteOriginally posted by Not a Number Quote
M1 smallest - will do custom - inquire about costs and minimums

We specialize in very small micro setscrews (mini set screws) from M1 to M3.

If you just need a couple screws for a one off repair - ask for free samples.
thanks!
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