... first from aluminum and then later out of steel that I had powder coated. The aluminum one worked well but I worried about it bending so made the steel one and have used it a lot with very good luck. You don't need screws or anything to hold it in place as it slides down into the track by the gooseneck.
Here is a videos...
https://www.youtube.com/watch?v=VFjyPjJZzdE
... and a link to when I built the aluminum one...
http://purplesagetradingpost.com/sumner ... ng-13.html
Sumner
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1300 miles to the Bahamas and back -- 2015
The MacGregor 26-S
The Endeavour 37
Trips to Utah, Idaho, Canada, Florida
Mac-Venture Links