Finally got this one figured out. Size is 5/8" 18 tpi. Straight thread. Neighbor Hank, machined one for me out of brass stock. Fits perfectly. Look at the miscellaneous album for the pics. Hank says he'll make these for a price!


http://community.webshots.com/user/geezer


Country Roads, West (By God) Virginia
http://community.webshots.com/user/geezer