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03-05-2017, 07:21 PM   #1
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Loose Pentax-M 400mm mount

The tripod mount doesn't seem to be able to tighten all the way. When the screw is all the way in, the tripod mount can still rotate (but with drag). There are four positions around the barrel where the turning mount 'clicks' like there is a hole the screw is supposed to fit into - but it does not hold.

Is it easy to remove the mount without lens disassembly? Anyone have a service manual?

03-06-2017, 04:59 AM   #2
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You might want to search out Eric, who seems to have the market cornered in terms of reputation for repair of Pentax legacy gear.

Also reach out to a few of the M or A 400/5.6 users here in the. Forum

It might just be wear, after all the lens is 40+ years old
03-06-2017, 04:42 PM   #3
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QuoteOriginally posted by Lowell Goudge Quote
You might want to search out Eric, who seems to have the market cornered in terms of reputation for repair of Pentax legacy gear.

Also reach out to a few of the M or A 400/5.6 users here in the. Forum

It might just be wear, after all the lens is 40+ years old
Go here. I just sent him a K2DMD.

Pentax Camera Service - Eric Hendrickson
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