Bernard, I read somewhere a couple years ago that somebody just used a small screw, like a #2 maybe? I was afraid that would tear up the rail, but maybe not. If MakerBeam gained in popularity, Randy Milliken at rail-buttons.com might be tempted to redo them. The new mini buttons he has are a big improvement over the original, in terms of looks. Both old and new, though, work really well on the 20mm rail.

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Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp