Quick Tip, but you have to be careful

If one of your rings looks really rough--lots of burn, bad blade or drill marks--give it a preliminary sanding before you glue it to the other rings. You have maximum access at this stage, but need to be careful not to take off too much wood, especially from the upper and lower gluing surfaces. And if you use a spindle or belt sander to do the clean-up, be extra careful since they sand so aggressively.