Used to be. Ukraine war has put a crimp in the supplies.

> Whatever you do you will have to readjust your spring tension which should be checked yearly or so anyway

WARNING: These springs can and will cause serious injury. While it's possible to DIY this, these springs have enough force to lift a heavy steel garage door. Be very careful to learn what to do, and not do if you're going to work on this.

How thick is the bow staff? You might not have a lathe, but you might find that putting the rough staff in a drill chuck is enough, assuming the staff fits. If it fits, you can then use the drill to turn the staff fast enough to sand it down.