A friend is looking for a mast for a Holder 12. If you have one laying in your pile of junk parts she'd be thrilled to buy it from you. Her boat has all the parts except the mast. It's hardly worth buying a brandy new one so I'm helping her try to find an unwanted one.
I would guess that if all else fails, a Laser mast could be made to work, just cut it to the correct length (trim the bottom tube). There have got to be a ton more Laser masts around than Holder 12 masts.
Barb, can you use a Sunfish down there on the beach. if not, Guess I will it on ebay, so I can cut the grass where it has been laying for several years. Rick