Masthead Repair
- Thread starter JacK P
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An internet search indicates you may have a Kenyon mast so suggest contacting Rig Rite for a manual on how to replace the sheaves Kenyon Spars Main Page (rigrite.com).
there are swept back spreaders and a backstay that splits about 10' up and fastens on stern on port and starboard
The early Selden rigs had backstays, if a Selden rig all you have to do is search Selden Mast Headbox to get an idea of what's involved.
Really quite simple when the mast is stepped, not sure that I would want to be hanging by my toenails attempting to relieve the weight of the halyards while unbolting the retainer bar and lifting out the sheave, but definitely doable.
I guess if you did one at a time it wouldn't be to bad, remove the retainer bar (1 bolt) block a halyard up to give enough slack to pull the sheave out, remove the axle, put the new sheave on the axle and drop it back in, see got one done for you already........
support.seldenmast.com
Really quite simple when the mast is stepped, not sure that I would want to be hanging by my toenails attempting to relieve the weight of the halyards while unbolting the retainer bar and lifting out the sheave, but definitely doable.
I guess if you did one at a time it wouldn't be to bad, remove the retainer bar (1 bolt) block a halyard up to give enough slack to pull the sheave out, remove the axle, put the new sheave on the axle and drop it back in, see got one done for you already........
Headboxes : Seldén Mast AB
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Thanks looks like the right head boxThe early Selden rigs had backstays, if a Selden rig all you have to do is search Selden Mast Headbox to get an idea of what's involved.
Really quite simple when the mast is stepped, not sure that I would want to be hanging by my toenails attempting to relieve the weight of the halyards while unbolting the retainer bar and lifting out the sheave, but definitely doable.
I guess if you did one at a time it wouldn't be to bad, remove the retainer bar (1 bolt) block a halyard up to give enough slack to pull the sheave out, remove the axle, put the new sheave on the axle and drop it back in, see got one done for you already........
Headboxes : Seldén Mast AB
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that's a Kenyon mast, probably from the 80's. The two bolts hold the mast head on. very simple if the mast is down.
I'm not sure it could be done with the mast up
Why do you think you need to change the sheaves?
Is the photo in your post #7 your mast head?
That's an easy head to work on - just remove the two bolts that go through the mast and pull that head off. Once you have it off, then the sheaves are right there. You have halyards in place so be careful to keep them in the right place, not twisted or anything. I think that mast head has 4 sheaves in it. Two on the bow side and two on the stern side. Your setup is likely not using all 4.
I'd get my mast set parallel to the ground and high enough so I can spin it so the spreaders don't hit the ground. This might not be necessary, but if once you have it taken apart, it might be nice to be able to spin the mast 180 degrees. Then I'd set up a flat work surface at the head to slide the mast head onto as I pulled it up out of the mast. That way you can pull it up just far enough to work on while keeping all the halyards and wiring nicely aligned. The sheaves are pretty easy to remove.
dj
