I know they've been around awhile but I'm still kind of new to them. I occasionally have to mount these Allied slider boxes
in new and old work situations, and sometimes they go in perfectly with no problems. However, yesterday I couldn't get them straight to save my life.
Yesterday was an especially difficult case because the upward angle of the screws and proximity with the countertop made mounting fairly awkward.
I just find it too easy to get one screw slightly off course, and then the slider twists the whole box. This causes the box to telescope forward at odd angles when you try to slide it out later. 
Once a screw sinks into wood, it really wants to find that same hole again even if I try to readjust away from it. Anyway, I'm looking for tips from anyone who knows what I'm talking about.
How do you get these things dead on, every time?
Electrical – Need Tips for Mounting screw-in Slider electrical Boxes
backsplashelectricalold-workremodelingrough-in
Related Solutions
Yes, such an adapter exists -- its called a "universal" or "all-purpose" crossbar, and looks like this:
Basically A is a time clock for B a low voltage transformer. C looks to be the hot in and D looks to be the hot out from the time clock to switch the low voltage transformer ( which apparently is being direct wired by cutting off the male plug).
Another scenario is the time clock does or used to do high voltage tree lights. The low voltage transformer used to be plugged into an outlet but is not used anymore. Just guessing.
Related Topic
- Electrical – Necessity of electrical boxes
- Electrical – Ungrounded Electrical Boxes
- Electrical – Why is one mounting screw left behind each electrical panel’s cover
- Electrical – Modifying electrical boxes with field mounting and knockout provisions
- Electrical – Using drywall screws for electrical boxes
- Wiring – Tips for replacing a wire inside a wall
- Electrical – Plastic electrical cut-in boxes with 3/8s tabs
- Electrical – Tips for getting cables through old work box knockouts and into wall
Best Answer
Use a small angle head drill and drill pilot holes - as you say the screw follows the existing hole.