Re: Nylon or aluminum cleats on mast?
What are these cleats being used for? For halyards the horn cleat works nicely because it also gives you something to hang the tail of the halyard from. My jib and spin halyards terminate at the mast (instead of the cockpit). I used clutches (a lot nicer than cam cleats) to handle the load, but they don't make it easy to organize loose tails of line.
In general I avoid stuff made by Sea-Dog line unless there is nothing else available. They always seem to be the lowest quality and budget items available.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior