by isb » Oct 23rd, '13, 20:26
I'm sure you can find a h**d o** that you could use for an omni deck. I've got a leather one made by Gary James from Edinburgh.
For your sponges, you could fashion something from a cylinder. A modified 35mm film canister works for fewer sponges, but for that number, maybe a longer tube? Cut a wedge shaped hole - push down with the thumb and load into palm. PM if you want a fuller explanation.
Ian