The DSS Thumb Loop kit is a bolt on retrofit for most Halcyon and Salvo Goodman Handles.
This kit should fit lightheads that feature a 2 inch (50.8mm) Flat mounting surface for the reflector with two screws at 1.5 inch (38.1mm) on center.
If in doubt measure your reflector and Goodman Handle.
This kit is truly bolt on. The kit includes a Stainless Steel Offset Plate, molded delrin Thumb loop and all required fasteners.
The Inside diameter of the Loop is ~ 1 1/4 inch (31.8mm) and will accomodate most gloved thumbs.
Installation requires a Phillips screw driver and a 5/64 or 2mm hex (allen) wrench.
Goodman Handle Thumb Loop Kit