where to order large diaphragm?

I just received the penimaster 2 days ago. it came with 3 medium diaphragms and sluices. I thought it was suppose to have 1 of each size. The medium diaphragm broke on my second use. I checked the penimaster website and they only have the small and mediums ones listed. Anyone know where I can buy the large ones?

Or any ideas why else it might have broke besides needing a larger one.

just to let anyone know i heard back from support they say they don't make the different sizes any more they just make the one size but say it is a new design that is suppose to work for larger and smaller. they suggested streching the diaphragm out before using it. so i started doing that, so my second one lasted about a week before it broke. So im not really sure about what i want to do here. Continue using it and just keep a large supply on hand or try to return it and try something else.

Ask for a replacement.

They gave a 20 euro gift card