Try to get a custom made one that screws into the butt. Most, if not all, cuemakers will custom build it so that your cue won't lose it's overall balance if you go this route. Here is a photo of mine, the bumper on the end of my cue pops off easily enough and the extension is made for a perfect fit. It was made by the Steve Lomax, the maker of the cue itself, and if you're willing to send your cue off, I'm betting he can custom make one for yours as well.