Re: rebuilding compass
I replaced a diaphram on a compass years ago. The compass manufacturer wanted me to send the compass in to have it done, saying I would never get enough fluid back in to prevent a bubble. They mentioned putting the fluid in the freezer for a DIY'er but I found an easier method.
Tape a string onto the diaphram. Pour the fluid in while pulling on the diaphram a bit. Fill the compass up. As you're putting the plug back in, have it facing up and release the diaphram a bit to so that fluid is spilling out of the plug while you're tightening it up. No bubbles on the first try.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.