[TowerTalk] US Tower questions

[Alan NV8A]

I ordered my HDX-555 and have already received the base plate and bolts 
by UPS (extra charge for advance shipping of those items), but I have a 
couple of questions that US Tower has not yet answered, so perhaps 
somebody here has the answers.

1. The mounting bolts came with three nuts each, but the drawings and 
installation instructions indicate only two. Is the extra nut to be used 
above the mounting plate as a lock-nut (a more scientific method of 
preventing the nut loosening than striking the protruding threads of the 
bolt, as shown on the drawing)? Or is it to be used as a lock-nut 
*under* the mounting plate to prevent movement of the leveling nut?

2. A note on the drawing of the Raising Fixture points out that the part 
to which the winch is attached may slope backwards away from the tower 
on some models. Am I correct in thinking that with the HDX-555 it will 
be vertical and will not slope back from the tower (because the base of 
the triangle is longer than on the smaller towers that use the same 
raising fixture)?

3. It is not clear to me from the details of the MCL-100 Limit Switch 
Package whether this comes pre-installed and pre-wired or whether the 
connections have to be made on site.

Alan NV8A