your exactly right fancman ! grade 8 bolts are not that easy to just drill out,especially in aluminum. The front hub is $40.00 and the magnets are $6.00 each for a total of $12.00 and then shop time and shipping.Is it really worth the so called extra assurance you think you would get from grade 8 bolts? I think not,atleast for me it isn't.the grade 8 bolts might take a little more pressure but the side load that is put on these puppy's would still cause them to snap if they were loose, especially when were pushing ove 9 horse and up with these larger engines. I'd rather spend the money on the wrench and check them frequently,that's really all it takes. I'm not brave enough to experiment with the other bolts so I'm gonna stick with the supplied bolts that come from the manufacturer. If by chance I do lose 1 or 2 or so I have a better chance of drilling them out if need be versus dynamite on the grade 8's. Just a thought.