I am contemplating putting slugs and shackles on my mainsail. Looking at the mast, I do not have a defined slot. The bolt rope is held by the two lips of the opening, but the "inside" is a rather large area. Has anybody used slugs on this type of slot? What slugs? thanks BTW went sailing Sunday. great weather in eastern North Carolina 10+ knots of wind. Bob S/V Knot Necessary