Device to Cover Soundhole While Spray Finishing Your Instrument

Device to cover soundhole while spray finishing your stringed instrument.Here is a slick device by John Fitzgerald to cover the soundhole while spraying finish. The hinged disk is slightly larger than the soundhole. The block that presses against the back is threaded. You flip up the flap to insert in the sound box, open the flap and then turn the disk counter clockwise to raise the disk to the back of the sound hole.