Vang 101
You don't have to pay for a pre-made vang-- there is no more magic to it than the sum of its parts. ANY 3:1- or 4:1-purchase tackle will work for a vang. It should ALWAYS be rigged to the base of the mast and on the centreline to facilitate tacking without having to adjust it. Anything putting a moment on the boom other than that is considered a preventer that has to be removed or slackened before tacking (it's VERY dangerous to forget a preventer! That's how booms break).Rigging this tackle at something approaching a 45-degree angle is most effective. This is why a vang is almost redundant with mid-boom sheeting. The vang is supposed to suck down the middle section of the boom-- if the sheetline is already doing that, you don't need the vang. What you'd need instead is some way to pull down on the END of the boom. That's where the sheetline is supposed to be.I would recommend Schaefer 505-series fiddle blocks, the bottom one with a cam and becket and both with swivel snap shackles. If you want to sub out another brand look for something about 1500 lbs breaking strength (for 3/8" to 7/16" line, for ease of handling). A decent extra-low-stretch line like Sampson XLS (cheaper than NE Ropes!) is fine.I would NOT consider eliminating the topping lift as it serves plenty of other purposes which a rigid vang will not work for. But that's another subject....JC 2