More Stupid Wiring Questions....

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Ok, so I got a new Winch. I switched from a Hydraulic to an Electric. If anyone cares, I can go into the reason, but I assure you, I wish I still had my Hydraulic.

So anyways, I get the winch mounted and all that good stuff. I found a spot to mount the remote Solenoid under the hood.

First I ran the wires from the winch to the solenoid, but before connecting them started to think about what's the best way to do this....

If I just connect the wires and make the wires tight, then when I need to drop my bumper to do work on it, I'd have to undo the wiring. If I leave the wires loose enough to drop the bumper, there would be a lot of slack drooping down...

Any suggustions on like how to mount like a bolt or something that I could tighten the 2 ends to and then just unbolt it as necessary?

So after not being able to figure that part out I tie wrapped the wires down to be figured out another day and moved on to connecting the Remote Solenoid to the battery.

It came with some pretty thick ass cables that seem to be near the same gauge as the ones bolted directly to my battery, so my first instict was to unbolt the leads and slip the ends over and rebolt. This is what I would have done, but the hole in the terminal wasn't big enough to fit the battery bolt in there.

I'm also wondering if that is an appropriate way to hook it up?

Out of the positive part of the battery the cable has this red box attached to it that says "Battery" with a very small red cable coming out of it. I opened it up and was thinking maybe I should put the positive cable in there, but then wasn't sure if that was a good way because of the little skinny cable that was coming out of there.

I'm also wondering if I need this thing fused or anything?

Also what is the best way to ground the black cable? I've never fully understood the mounting it to any old screw. How do I know it's actually hooked up properly?