One of the thing on my list of upgrade for my S2 was to replace the Shaeffer jammers for the lifting keel and the main and jib halyard. I had read all the literature and blogs about the two most popular types. Lewmar makes a D1 and Spinlock makes the XAS model which are the best for my small 22 footer. I have replaced the lifting keel line and the halyards with Sta Set 5/16 inch line.
Safe working load for the XAS is 990lbs. A single Spinlock XAS will cost you about $75 dollars.
One drawback of the Spinlock XAS is that you cannot open or release it under load. You have to use a winch to unload the clutch before you can open it. You can however winch a rope through the clutch while it is closed.
The Lewmar D1 can be opened under load and you can winch a line through the clutch while it is closed. The price for a single D1 clutch will cost you $60-65.
Here is a picture of the Lewmar D1 that I recently installed on my retractable keel. Keel weight is about 430 lbs.
I would recommend the Lewmar D1 and I will be buying a double Lewmar D1 to replace the double jammers for my main and jib halyard on the port side.
Has anyone else had any failures of the Spinlock clutches?