[Jeff Pahl]

Like many things, the answer is "it depends".

I'm sure I'll get to look at lots of unshielded shooter wheels in the next few days. My feeling on the subject is that any moving parts that extend outside of the mechanism such that they could catch clothing, hair, fingers, etc in the pits, or that could make contact with another robot or the field while on the field, will need to be enclosed. Obviously, you can't cover the part of the wheel where it makes contact with the disk, which hopefully is within the mechanism and is reasonably enclosed.

Again, "it depends" on the exact implementation of the mechanism in question and the opinion of the LRI at any particular event. I fully anticipate this being the "headache issue of the year" at Championship, and my advice would be to err on the side of caution and safety.