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11-19-2011, 07:44 PM   #1
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Screw trouble

I'm doing a lens clean and repair to the aperture mech. but I've struck trouble.

One of the tiny #0 philips screws is so tight that it chewed out the head.

Does anyone know any tricks for when this happens ?


Chromo

11-19-2011, 08:14 PM - 1 Like   #2
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Are you sure it's a Philips head? It may be a JIS which is why it got stripped. There are two things you can try. Find a rubber band small enough to fit over the screw head and then use a slightly bigger screw driver.

Remove a Stripped Screw with a Rubber Band

The other way is to drill the screw. Good luck finding a drill bit small enough.

11-19-2011, 09:22 PM   #3
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I've done this pulling apart a junk lens. As I wasn't too concerned with anything but the glass I was pulling out, I just used my screwdriver to go over the head of the screw over and over again to drill through it. It took a bit of time... but it did the trick. But I assume you want to replace that screw since you're doing a repair on the lens... I have no ideas on that part. Sorry.
11-19-2011, 11:01 PM   #4
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I have heard that some of the screw assemblies use a form of loctite on them that makes it near impossible to remove unless you apply heat first.
You could try touching a soldering iron point to the head and trying to loosen it with the screwdriver immediately before it cools.

11-20-2011, 12:09 AM   #5
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We just discuss about this.
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/162247-lens-bu...sed-up-32.html
11-20-2011, 01:59 AM   #6
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Original Poster
Very interesting.
I have never heard of jis screws before this.
I had a look and they are jis.
I have one more screwdriver which I'm going to try out in a minute but I don't hold hopes for it.

If I have to drill it, that won't be a problem for me, but I am worried that there will be enough screw shaft left over to grip...Then there's the problem of finding a suitable replacement. This screw is one of three and I had no trouble getting the other two out, but they are 10mm long x 2mm, so I can only hope that one of my stock of laptop screws will do the job.

Thanks for the info guys,
I will prob be back soon, I have another couple to do as well.
Chromo
11-20-2011, 02:03 AM   #7
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Well I'll be stuffed !
The rubber band worked.

Now that's a real neat trick.

Cheers,
Chromo
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