I play a kit very similar to that. I have one arm and have used it with little success, no matter how tight you put them they slip. The Fibes drums from that era are very heavy. Your better off using some kind of suspension mount off the cymbal stands. I use Pearl Optimounts but there are others that would work as well.
All old mounts need a good cleaning & de-greasing of the contact surfaces to work well, doing that can improve the holding capability quite a bit.
band2