When I look at EAA's Hints for Homebuilders video channel, I don't see anything about making steel fittings and these are some of the most important structural members on the airplane. I thought it must be because they are just no-brainers (not so!). Here's the blade a 52 tooth, titanium tipped. I also used Boelube, which I highly recommend. I was really surprised at how easy it was to file the 4130. I expected to take hours, but it really went fairly well.
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