I was changing the strap on my recently acquired Glycine Pumpkin, which was fitted with the bracelet and I wanted to try the black rubber strap (new and unused). I got it fitted OK, but the strap "grabbed" the spring bar and when I got a new Glycine orange rubber strap I found it difficult to remove the black rubber strap as the spring bar (actually a screw bar) was stuck in the strap holes.
I removed it by putting the watch in warm water, and then fitted the new strap but lubricated the screw bar first with a little silicone lube that came with my Arai crash helmet - much easier to fit and I'm hoping to remove too.