With the recent threads on magic forearms and fanning it struck me that the fanning move (external rotation of the humerus) is not a common move in life or in the average golf swing.
Easy to muddle with forearm motion...
I have never used a TALY but it struck me that it might be a good visual to attach 1 TALY to the right forearm and 1 TALY to the right upper arm...
If you align the "clowns' noses" (and conceivably even dress up one nose like a beach ball - ie. different coloured stripes) at address - would it provide a good visual to seperate supination (forearm) motion from external rotation / fanning of the upper arm?