mossemi 426 Posted July 8, 2019 Share Posted July 8, 2019 I stumbled across this tutorial while reading about a Balmar battery monitor and thought it contained some excellent information. Although the article is really about re-bedding deck hardware on boats with through bolts and butyl tape, I thought the discussion about drilling holes and finishing with a countersink bit would be of interest to other OTTO's. And the Balmar battery monitor also looks like an interesting product. https://marinehowto.com/bed-it-tape/ Mike 5 Mike and Krunch Lutz, FL LEII #193 “the dog house” Link to post Share on other sites
DavidS 307 Posted July 9, 2019 Share Posted July 9, 2019 I think I am like Mike in doing research on the web before tackling a project. Sharing information here, with a good title for the post, is a great idea. Before using Mike and Carol's instructions on moving the TV, I did a lot of research on drilling thru fiberglass. This web site helped me on drilling thru fiberglass, and this web site on using a hole saw. I also followed John Davies' advice to put down masking tape to prevent splintering of the fiberglass gel-coat. 3 David Stillman, Salt Lake City, Utah 2016 Oliver Elite II Hull 164 | 2017 Audi Q7 tow vehicle. Travel and Photography Blog: http://davidstravels.net Link to post Share on other sites
Moderators Overland 1,220 Posted July 9, 2019 Moderators Share Posted July 9, 2019 I haven't had good luck countersinking with a metal bit - the gelcoat always wants to chip. But a tapered grinding bit on a Dremel seems to do the job well. 1 Snowball • 256 • 2018 Ford Raptor Link to post Share on other sites
mossemi 426 Posted July 9, 2019 Author Share Posted July 9, 2019 I have used both with equal results. The countersink bit is faster. I haven’t tried reverse drilling with the countersink, but that may be an option. I would be willing to bet a cup of joe that my countersink is more dull than yours?. Mike Mike and Krunch Lutz, FL LEII #193 “the dog house” Link to post Share on other sites
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