ORIGINAL: Captain Nemo12
Also, does anyone know local stores or places (hardware stores, bike shops?) where one might find rubber bellows? Seems kinda ridiculous to me to ship something worth 2$ over from the States...
Graupner bellows are part #3356 used in all Engel sub kits. Robbe bellows as per their U47 is #1400. I imagine your LHS should be able to order them for you.