One side of the runners, the one with the 4 plastic triangles, is made to fit into the holes of the curtain. The holes in the Spirella curtains are just the right size. It clicks into place and works well.
I'm not entirely sure whether the glides on Spirella shower curtains can be replaced without dismantling the curtain rail. The information I have relates mainly to the assembly and properties of the shower curtain rails themselves. It would be advisable to consult the official instructions or Spirella's customer service for exact instructions.
If you use the push-button system, you do not need any additional rings. The shower curtain can be hung directly. It's very easy :) We have a shower curtain from Spirella, so maybe it only works with that. Or did I misunderstand your question?
Unfortunately, we don't know how to get it back together and to correctly fit. It would be best if you contact the manufacturer directly.
http://www.spirella.ch/en...
As long as the shower curtain has holes for the glides, it should not matter whether they are reinforced or what material the shower curtain is made of. Sturdy eyelets prevent the eyelets from slipping out of the glides. However, if you are not tugging at the shower curtain, the punched/reinforced eyelets should also hold.