Guys i just search and buy the orginal flat top cap by buying a complete distributor on ebay. You can get a deal on them from time to time.....The MA5 is just a normal type cap not the flat top Mallory.........
Heres the deal of the day :
https://www.ebay.com/itm/Vintage-Mal...ty!46224!US!-1
and then you can machine this one to fit the flathead as well ????
We just light glass bead the old cap and spray with clear coat. Inspect the center carbon button and use them again they work very well...... brass contact dont seem to wear out...