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A problem with simply adding any sort of block to these is that the block will flop around and eventually mark/damage the deck. You can buy 'stand up' springs to keep the block upright to avoid this.
Assuming this isn't your only lead car on the track. On many boats, when you have the jib car fwd for a small sail, the port sheet tends to chafe on a coaming/cabin side as it leads to the inside edge of the drum. You could use this to ensure a fair lead to your winches by pinning it at the aft end of the tracks and also run the sheets through a block there.. that way the lead angle to your sheet winches doesn't change when you adjust your genoa/jib car for trim or for different sized headsails. It would add a bit of friction drag, though.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Last edited by Faster; 01-27-2011 at 06:24 PM.