Hi scooby
thanks for that warning! I think your are right about my block on the top of the mast
![](http://www.catsailor.com/forums/images/graemlins/crazy.gif)
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I think the best way to measure the mast bending, is using the sail without inserting it into the leech but attaching the head of the sail at the top of the mast as normal. then connect the cunningham and the mainsheet with the free hanging sail and pull them both tight.
To measure, use a small chord tied to the top and to the gooseneck, and go on as bill described before.
thanks all for sharing your knowledge!