Hi Christos,
Not sure if you have already ordered membranes but I would be interested in joining the order. Probably for around 100 pieces. There is another recent forum post who might be interested in joining the order too.
I also had the same issue with holes forming in the membranes and am interested to hear that it was insects! I was a little perplexed.
Also, when I received the membranes in the post last time some already looked a little worn - if you held them up to the light some had a change in transparency across the membrane. Did you experience this too? I had been discussing with the seller to try and identify why this was but haven't got an answer so far.
Thanks,
Catherine