Cheap tap handles I use to ID the style on tap. Just used a 3/8-16 x 7/16 T-nut with flange with brad holes purchased at Lowe's. Hardest part was finding the center of the cap for drilling the hole and inserted the t-nut from in side the cap. The tube seats against the flange inside the cap.
Edit: I added the photos but couldn't get the t-nut out of the cap. It fits nicely.
Edit: I added the photos but couldn't get the t-nut out of the cap. It fits nicely.