Cushcraft p/n designator
TA...............................10m trap has 18 turns
TB...............................15m trap has 31 turns
TC...............................15m trap has 31 turns

6 TA traps go on the inside (boom side) on all three elements.
2 TB traps go on the outside on the front (director) element.
4 TC traps go on the outside on the driven and reflector elements.

The side of the trap that has the screw connecting the outer shell to the element, 
always goes towards the boom. 

Instead of the plastic caps used buy some 2" heat shrink, cut it to about 2-1/2" long, and 
shrink it down. It'll last much longer!! $2/ft from:

 john@honestjohnUSA.com

TB has longer outboard (swaged) end, 7/8" side toward boom is about 1/2" shorter on the TB