For the banjoleles, action and neck angle can be adjusted by changing the number of black washers under the L bracket. Simply de-tune, remove the Philips screw holding the L bracket to the strut, and remove one of the black fiber washers to raise the action or add a washer to lower the action.
For the 5-string banjo, action can be adjusted by loosening the 3/8” lock nut on the inside of the drum where the metal coordinator rod attaches to the tailpiece. By turning the Philips head screw in, the action will decrease. Turning the screw out will increase the action. Tighten the lock nut after adjusting.