A: I bought more than 100 for a project (had to go to three stores to get them) and never again realized they had not been replaced.
A: No covers are meant to be permanent
A: Yes, I dip them in boiling water first to loosen the plastic tip, and then they slip right off.
A: Yours would be the first!
A: These clamps will service functions such as attaching a cord of umbrella lights to a patio umbrella.
A: Possibly however they will probably rust outside and the rust would get on your umbrella unless the lights are on the underside. May still have a rust problem. Considering that drawback they would probably serve your purpose. I use them to hold weave when I am making primitive rib baskets.
A: Yes - they have super strength and are VERY small so in my opinion they won't look obtrusive.
A: Wire diameter depending. Look at the picture and visualate. They're strong enough to hold a wrung-wet bath towel,
A: Yes, these should work for that as long as the cord isn't larger than normal (think "lamp cord" and not "heavy-duty extension cord"
A: I only saw them sold individually at the store (there were over 400 in stock).
A: I purchased them loose. I don't know, it was a good size box I got them from.