Here is my set up.

1. Cateye SP-6 mount to wrap around the body of the dinotte tail light. (Hint they came with your Cateye tld-1000) It makes for a very tight fit around the Dinotte.

2. Look for some older reflector mounts. I found a few at the LBS and at home, You need to look for the ones with an extend reach just a few millimeters from the seat post. The extra reach will allow you access to the switch and full tilt up or down vertical mobility.

So far this mount seems to be rock solid. Just take your time over the Railroad tracks.