Drives - Go Blue is a 1-HP HD Block, set up for aggressive wire wheeling, the 3/4-HP Block is for 'normal' wire wheeling.
The wheel guards w/ covers, and eye shields are in place on all Blocks. I wear safety glasses with side-shields all the time in the shop, plus a full face mask at the grinders.
I adjust/remove the tool rests as necessary for clearance/access on the
wire-wheeling Blocks.
I wear long sleeve shirts - to catch the flying needle-like wires, flying-off (even good-quality new wheels, like Weiler).
I added the fuse at the suggestion from a OWWM member.
I have since seen 2 posts and bought 1 Block with 'fried' start-up windings, which made the repair/rebuild cost prohibitive. While I am not sure the fuse will prevent this kind of fatal failure, it seems a reasonable effort.
I too, don't understand the logic of doing something with possible (not necessarily probable) dire results, and continuing to do it because 'you' have not had a problem (yet).
Just because a squirrel can run across a busy street 20 times, doesn't mean it is safe.
All:
1) - Drives' thread is a must view/read to keep in mind of the dangers from these simple machines.
http://www.garagejournal.com/forum/showthread.php?t=263083&highlight=grinder+101+safety
2) - See my signature link(s) for more information on grinding safety.