The little grinders used to have all sorts of spindle sizes, some of which were metric. Lately, the industry seems to have standardized on 5/8" spindles, and even the HF cheapies seem to have that size.
I do the same as you except I don't collect the real cheap HF grinders. I go up a step and buy the $15 models if they go on sale. I find that the weak point with these grinders is the cord where it enters the handle. The rest of the grinder holds up pretty well. I have a good Hitichi that I use the most, and a Dewalt that is second fiddle. The HF models get wheels/discs that I use less often. If I'm using one wheel a lot it goes on the best grinder. This saves me a lot of time by not changing discs, just picking up another tool.
I have standardized on the HF lock nuts because I have so many. The Dewalt has a hex nut that requires a different wrench, and I'll change that when this disc wears out. I haven't broken a HF pin spanner yet, but if I broke them all and had to start over I'd make one from 1/8" flat bar and use either dowel pins or Grade 8 bolts to make the pins. I think your problem was that you used nails, which are too soft to hold up to this applicaion.
Usually, the disc has enough meat left on it to get enough of a grip to remove the nut without a spindle lock. If it is worn too much to hold by hand, it is junk anyway and you can use pliers on it. I have never had a spindle lock fail on a HF unit, but then I avoid the cheapest model.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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