One table. One pot. No win above it.

Put money in.
Take money out.

Everyone names a buy-in. That sum is the pot. A spin can pay no more than what is left. When the pot hits zero, the floor closes until someone adds more.

Your buy-in goes into the pot and buys you spins. What you win is yours. Whatever is left in the pot at the end comes back by how much each person put in.