Surebets: Yeah I knew about that but they seems to have some problems stocking parts... It seems to take weeks/months before they stock an item they don't have anymore (I've been waiting for them to have some nozzle for 2 months... finally ordered what I needed from KevinMan.hk).
Thing is his springs (same part # than KWA's) were too long. I cut them and it works, for now.
I did try Rubber bands anyways, just for the heck of it and maybe having a viable solution for the future that would be faster/cheaper than to order more springs. I gave
these bands a try, cut them to length and pierced a hole at each extremity so the "posts" on the block/nozzle can get through them. And turns out it worked marvellously well, until one of the bands got out of its post. Probably just a tension/length adjustment and it would have worked better.
I'm not sure if it was just me but I had a feeling that operation was better with the bands, as it has more tension than the springs. Now the question is about knowing if it puts too much stress on the plastic or not.
I'd just need to find a way to make sure they stay in place. I thought about epoxy and what not obviously but that would mean permanent and unremovable if anything goes wrong.
If anyone have some ideas to have them stay in place more efficiently...