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Re: Spirit 23 potential purchase
the only modifications that I made was to use a larger diameter roller, add the grease nipple and fit the 6mm pipe all the way to the aft floor support (with another collar to keep the grease inside the pipe). When I re-launched her last April after buying her, she started taking on water because the cable arrangement is below the water line. There was just the nylon collar in the tank connector to keep the water out. The greased-filled pipe stopped that.
Just before Christmas I cut the whole thing out and replaced everything. The metal roller housing is 75mm (3") wide, 100mm (4") high and 150mm (6") long. It is made of some sort of alloy, as there's not a spot of rust on it. Inside the box, slightly aft of centre, there's a 85mmx12mm (3 1/2"x1/2") stainless steel pin. This holds the roller in place. The original roller was 3/4" diameter and I thought it was too small a diameter to have a steel cable go over, so I replaced it with a 2" bearing roller. The purpose of this is to prevent the cable or rope from rubbing on the aft side of the box when the centreboard is lifted.
I've attached another diagram to show what might happen with my setup. I know it does touch when the centreboard is fully lifted (but that's because the lifting ring on my centreboard is about an inch too low, so swings back just behind the slot opening).
If you have a vertical rope to lift/lower the centreboard, then you might need two rollers. That's because with a single roller the rope WILL touch the fore edge of the keel slot when the centreboard is lowered. You might be able to shine a torch up the slot when she's lifted (or by diving underneath), but it's not easy to see. The hole size on mine is approx 2"x2". (and now that it's got a grease skirt I can't see into it anyway.)
I should say that I never got to see the alignment when the centreboard was lowered. It might be that the centreboard anchor is exactly below the slot, in which case the rope/cable should not touch the fore side of the keel slot. So a single pulley might be OK.
Last edited by i_dunn; 01-13-2018 at 02:04 PM.
Reason: alignment in diagram might be off