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01-17-2014, 10:09 AM   #1
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Source for plastic bump on Pentax-A/M lens barrels?

Hello Pentaxians,

I'm considering buying a Pentax-M lens, but it is missing the white plastic bump on its lens barrel. I have found that these are quite useful for gripping the lens when installing or removing it from a mount.

This photo shows the bump here in case my description is not clear (the one in this photo is yellowish):

Does anybody know of a source for obtaining replacement bumps - original Pentax items or something similar?



01-17-2014, 10:16 AM   #2
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Leica & Pentax & Nikon | Leitax has some red Leica ones. Pretty sure it'd function more or less the same. (Albeit, 3 Euros seems a tad steep)
01-17-2014, 10:21 AM   #3
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I don't know if you can find one for Pentax but arts and crafts stores (such as Michael's in the US) sell little plastic beads in many colors and sizes. These were perfect replacements for the red bump on Minolta lenses.
01-17-2014, 10:36 AM   #4

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Finding a Pentax-M 50/2 for $20 or less is not hard...

01-17-2014, 11:13 AM   #5
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Just find a grungy lens, like this

SMC Pentax 50mm 1 1 2 Super Fast Lens for Parts Repair 1449772 | eBay
01-17-2014, 11:27 AM   #6
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QuoteOriginally posted by boriscleto Quote
Ha Ha Ha ... yea, at $144! Good catch!

01-17-2014, 11:54 AM   #7
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The white bump has another practical purpose.

It lines up with the lens unlocking button for blind lens install. Anyone with a history of LBA has extras. Strangely the kit lens for the MX, the pancake 40, does not have one.

Last edited by aoeu; 01-17-2014 at 11:54 AM. Reason: added commas
01-17-2014, 09:29 PM   #8
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Thank you all for the great leads and other replies! This sounds like a very solvable problem.

01-18-2014, 12:48 PM   #9
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I like the craft store option. I wonder what color bead would look good on my Zenitar fisheye?

01-19-2014, 08:59 AM   #10
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QuoteOriginally posted by stevebrot Quote
colour bead would look good
A Canon Red "L" Lens one, just to confuse folk.
01-19-2014, 11:17 AM   #11
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remember those long strips of paper with hundres of little candy dots on them ? lifetime supply.
01-19-2014, 11:26 AM   #12
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QuoteOriginally posted by kerrowdown Quote
A Canon Red "L" Lens one, just to confuse folk.
Or red for Commie lens!!!

01-21-2014, 07:20 PM   #13
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Shouldn't hard to sculpt your own out of marine epoxy if nothing else works.
01-21-2014, 08:12 PM   #14
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A dot of fairly thick two part adhesive, like Araldite might work.
On another note, the way that 50mm f1.2 has been treated should be a criminal offence. "The barrel shows signs of wear" is the understatement of the century.


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