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  #1  
Old 13-05-21, 00:25
David Dunlop David Dunlop is offline
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Hello James.

They are a slotted pan head machine screw, 8-32 x 1/4-inch, with matching internal toothed lock washers.

You may end up needing to find 1/2-inch ones and trimming them back. Clearances inside the PSU Case will be critical, to allow for its safe removal from its case with the calibrator mounted.

Hope this helps with the project.

David
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  #2  
Old 13-05-21, 01:09
James D Teel II James D Teel II is offline
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David,

As always, you’ve come through! Much thanks.
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  #3  
Old 13-05-21, 01:59
David Dunlop David Dunlop is offline
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You are welcome, James.

Not sure my explanation covered all the bases, however.

The pan head is necessary as it ends up inside the PSU Case when the calibrator is mounted. That gives clearance for getting the PSU in and out of its case.

The screw shank ends up sticking into the calibrator case, where it needs to be short enough not to snag the calibrator chassis when it needs to be removed and replaced.

David
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Old 13-05-21, 03:08
James D Teel II James D Teel II is offline
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That’s a good reason. By the way, are those UNF or BSF threads? I ask, because I recently restored the lunette assembly on my No1Mk1 trailer, and found both types as original equipment in close proximity to each other.
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  #5  
Old 13-05-21, 05:09
David Dunlop David Dunlop is offline
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8-32 NC according to my guage set, James.

David
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  #6  
Old 13-05-21, 08:41
Bruce MacMillan Bruce MacMillan is offline
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even the manual omits the screw size except that they are round head. If the calibrator is mounted flat on top the crystal holder has to be rotated.
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File Type: jpg xtalcal9.jpg (62.1 KB, 1 views)
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  #7  
Old 13-05-21, 15:16
James D Teel II James D Teel II is offline
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80A3864C-CA10-4081-A357-FDA7A56E997E.jpeg
Quote:
Originally Posted by Bruce MacMillan View Post
even the manual omits the screw size except that they are round head. If the calibrator is mounted flat on top the crystal holder has to be rotated.
We have almost the same manual. I’m sure somewhere there’s an actual parts catalog, but until then, I have to ask if they’re missing. Edit: I’ve no idea why this posted sideways like that. It’s frustrating.
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  #8  
Old 13-05-21, 15:10
James D Teel II James D Teel II is offline
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Quote:
Originally Posted by David Dunlop View Post
8-32 NC according to my guage set, James.

David
Thank you.
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