These are Spendor BC1 speakers, English made, late 70s, and I need to strip and re-finish the cabinets, as the speakers are fairly valuable. I have enough experience to strip the old lacquer /varnish to bare wood, but am not sure whether any finish I can apply in my garage will be good enough. It has to look professional, clear satin, and show the beautiful grain. Can you suggest what product / method might be used?