Need Coin for DX-20

[] William Ward]

The final tank coil in my DX 20 measures 1-1/4 inches in diameter and is 12 turns per inch.  It looks like 20 gage wire, possibly 18.  This does not equate to any Airdux or Miniductor made by B&W that I can find.  Can anyone suggest a suitable replacement from another manufacturer?  
Tnx
Bill, W4PCK

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