Yeow!
Don, I send my sympathies! I got a hernia (first ever) installing a 750K6 engine in 2010.
I also had those aftermarket 'blade' fuse holders (singles) fail on me. They would get real hot because they made poor contact with the blade fuse, just touching along one edge of each blade. This melted the fuse, in freeway traffic at 70 MPH. (!)
That's what got me to making the fuseholders I do now.
On the flip side: I then replaced the fuseholder by just plugging in the blade-style fuse to the OEM terminals in the harness (nice tight fit) and cut the rubber jacket off the aftermarket holder, then wrapped it around the fuse.
Once corrosion gets started on the contacts, it grows quickly. If you can find it, a spray-on product called LPS-1 is out there (in 1 ounce, 4 ounce and 8 ounce spray cans) that will absolutely stop the corrosion, even if it gets wet. Don't use LPS-2, 2.5, or 3 as those are different products for other purposes (like a WD-40 or such), just the LPS-1 is the 'magic' stuff, developed for the Navy to stop corrosion - and it absolutely does. A drop does it!