I just purchased an Oday 22 and I want to add a self furling head sail. What brand of furler do Oday 22 owners recommend?
I bought a CDI Roller Furler FF-2 for my O'Day 222 and I recommend it highly. I bought it off Rudy at D&R Marine
http://www.drmarine.com/ and he told me to get the furler without ball bearings. All that drum needs to spin on is the big washer that comes with it. Larger furlers require ball bearings, but the bearings can be troublesome on these furlers.
Make sure that you get enough control line to mount the cleat as far aft as you can. Don't mount the drum control line cleat in front of a Gennie winch. The sheet will get fouled in it every time you go to tack. The CDI furlers can be reefed which is a great feature.
If your sail is old, you may be better off buying a sail to go with it because you would need to have your present sail converted over from piston hanks to a special tape that fits into the Vinyl luff on the furler. Also, the old sail would need a UV shield sewn on to it. Without the UV shield, the sail will only last three seasons.
Decide which side of the boat that you want the control line and also which way you want the sail to roll up.
My sail rolls clockwise and the line is on the Starboard side of my boat. A sail maker needs to know which direction that the sail will roll so that he can sew the UV shield on to the correct side of the sail.
This year, I mounted a horn type jam cleat just behind my stern rail post not far from my regular stern cleat. I had to cut a deck plate into my fuel compartment to be able to get at the bolts for it but it was worth it.
You can't beat a good roller reefing furler.