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#1
12-05-21, 23:23
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WS-19 Crystal Calibrator attachment
In the instance of the WS-19, does anyone know the sizes of the screws and special washers used to attach the crystal calibrator to the side of the PSU? They’re not listed in the manual. Thanks.
__________________
V/R James D. Teel II Edmond, Oklahoma Retired Police Sergeant/Bomb Tech 1943 Willys MB/ITM jeep 1942 SS Cars No1Mk1 LtWt trailer 
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#2
13-05-21, 00:25
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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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#3
13-05-21, 01:09
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David,
As always, you’ve come through! Much thanks.
__________________
V/R James D. Teel II Edmond, Oklahoma Retired Police Sergeant/Bomb Tech 1943 Willys MB/ITM jeep 1942 SS Cars No1Mk1 LtWt trailer
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#4
13-05-21, 01:59
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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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#5
13-05-21, 03:08
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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.
__________________
V/R James D. Teel II Edmond, Oklahoma Retired Police Sergeant/Bomb Tech 1943 Willys MB/ITM jeep 1942 SS Cars No1Mk1 LtWt trailer
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#6
13-05-21, 05:09
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8-32 NC according to my guage set, James.
David
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