Hi Peter
I basically don't like rigging screws on small boats. I have got one on my forstay, which is just hand tight, and lanyards on the shrouds. The risk with rigging screws is that you can too easily over-tension the rig and cause potential damage. The usual scenario is that you are sailing on one tack and notice the leeward shroud is loose, so you tighten up the screw. Then after the next tack the new leeward shroud is loose, so you tighten that. Do this often enough and there could be an all mighty bang as your mast is catapulted down through you keel. These aren't high performance, high tension boats. Lanyards work fine, they are easy to check and tighten and don't unscrew when you take your eye off them (which happens on my forestay. I may well replace it with a lanyard at some stage.) Lanyards are also much easier to use when rigging your boat. You can always get a lanyard in place, even loosely. With screws, once you have got one side set up, you will go round the other and find you haven't got enough adjustment to hook on, so you have to go round and loosen then far side etc etc. You can always get a lanyard on to secure the mast and then spend your time getting them all balanced. They are also cheap and easy to replace.