It's nice to have more than one lens ready to go for your enlarger. Buy another board, either new or used. If you can't find one immediately, you can make one from printed circuit board material that will work fine until you can find the (more durable) real thing.
Most of my lenses are 39mm mounts. So I got the 39mm threaded board. It's a snap to mount lenses. No worse then any thread mount camera. The 150mm is on it's own board but that's because of the bigger mount.