This all started when I replaced the worn-out turning blocks at the ends of my boat's traveller. THe blocks were held in place with two 10-24 machine screws, presumably (I thought) screwed into the aluminum traveller bar. Naturally, the screws were frozen, and snapped off when I tried to remove them. I figured it would be pretty difficult to remove the broken off screws, so I simply relocated the blocks a little further outboard, drilled and tapped new holes in the traveller bar and attached the new blocks. I thought I was done. Wrong!. Next time I went sailing, the traveller pulled out, taking the panel it was bolted to with it. It turns out the screws holding the blocks had actually extended thru the traveller bar and into the deck below. While the traveller bar was secureley bolted to the fiberglass panel over the entry way, the panel was only held down by effectively two relatively small wood screws at each end. These were not up to the loads from the main sheet.
Obviously, the thru screws at the ends of the traveller bar had to replaced. I decided to upgrade to 1/4-20 machine screws for these, making them separate from the screws holding the traveller blocks. Installing was a simple matter of drilling thru the traveller, drilling clearnce holes in the wood below, then drilling and tapping into the aluminum plate located below the wood. Everything then got bedded down with butyl tape and reattached.
Obviously, the thru screws at the ends of the traveller bar had to replaced. I decided to upgrade to 1/4-20 machine screws for these, making them separate from the screws holding the traveller blocks. Installing was a simple matter of drilling thru the traveller, drilling clearnce holes in the wood below, then drilling and tapping into the aluminum plate located below the wood. Everything then got bedded down with butyl tape and reattached.
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