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Plunger and grounding coil
Completed pre 1976 PDWA
1976 and after PDWA note rounded end metric threads (1)
1976 and after PDWA note rounded end metric threads (2)
1976 and after PDWA note rounded end metric threads (3)
  1976 and after PDWA note rounded end metric threads (4).JPG - The 1976 and after PDWA is shown for selling on the web, and also to demonstrate the difference between the two. I will be sticking with the all Imperial pre 1976 device.  
Trimming 2mm oring material to fit
Home made oring
two original square rings and five of seven attempts
 
 

14 | The 1976 and after PDWA is shown for selling on the web, and also to demonstrate the difference between the two. I will be sticking with the all Imperial pre 1976 device. Download
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