DSS Goodman Handle Thumb Loop

I just installed a DSS Goodman handle thumb loop to my Halcyon 18W light. You can buy it here.

It came nicely packaged and with instructions. Here are the illustrated steps:

1. Remove bulb and ballast from Goodman handle.

2. Unscrew reflector from Goodman handle.
3. Screw the offset plate into the reflector. The screws came too long so I used a metal file to file them down. If they are too long, they stick into the barrel of the reflector, getting in the way of the bulb.
4. Screw offset plate into the Goodman handle. Notice how the reflector is offset from center.
5. Voila! Here's the finished product. Seems pretty robust. Unfortunately, it might be a few weeks before I get to try it out.
Btw, I was rather annoyed to find that the DSS thumb loop does not fit the older Halcyon warm water Goodman handles. The handle is simply not wide enough to fit the thumb loop. Should I offload the thumb loop or should I buy a new Goodman handle? Decisions.