Re: Mainsail Gates and Slide Stops
I made a simple adaptation of a standard curtain track end-stop - it happend to be the Silent Gliss brand, but most will do nicely. This one has nice big metal loop with a screw and nut on the other end. The good thing about it is that I can turn it with my fingers (or when cold and wet, insert a spike). Also, an absolute minimum of DIY was needed to make it work.
If these standard types don't suit you, then I'm sure if you shop around then you might find something that will fit (I've seen a I-Beam track end adapted to be used this way).
Cost - £2.50 for two!