Try this: Heat up the sticker a bit with a hair dryer or heat gun on the lowest setting. That will get he adhesive in a more gooey liquid state. Apply to the bottom of the Twiddler. It's a pressure adhesive so you have to put some pressure on it to make it stick. Not lots, but some.
If you go the crazy glue way, try to remove as much of the adhesive as possible and glue to the back of the velcro as much as you can. Remember with crazy glue, less is more.