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I know they've been around awhile but I'm still kind of new to them. I occasionally have to mount these Allied slider boxesenter image description here 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.enter image description here Yesterday was an especially difficult case because the upward angle of the screws and proximity with the countertop made mounting fairly awkward.enter image description here 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. enter image description hereOnce 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.enter image description hereHow do you get these things dead on, every time?

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    Your last 2 images appear to be identical, did you mean to upload something else?
    – FreeMan
    Commented Jul 22, 2020 at 12:26
  • yes, thank you. I've swapped the duplicate out and added another view. Commented Jul 22, 2020 at 17:36
  • I think I need to find some of these! They're certainly not at my local big-box. Those look so much easier to use and adjust than either nail in new work or "wing-and-flange" old work boxes.
    – FreeMan
    Commented Jul 22, 2020 at 17:52
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    @FreeMan, thanks for the ideas. The boxes are a bit tricky in some locations but I'm finding they aren't bad if I am able to hold them firmly in place with one hand and run the impact driver with the other. I think I need to find a clamp of some kind to act as a third hand if I ever have to use the right angle attachment again (which requires two hands just to operate). The boxes are nice for tight places where it's difficult to drive nails, and they slide out to the extra depths of layered finish, such as tiled backsplash. Another con: the slider sometimes hinders wide devices such as dimmers Commented Jul 24, 2020 at 23:44

2 Answers 2

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Use a small angle head drill and drill pilot holes - as you say the screw follows the existing hole.

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    I could see sacrificing one as a "starter" piece by pulling the slider out and removing the screws so you've got the spacing and the alignment right. Of course, you may be able to do that, then reinsert the sliding piece and the screws and not have to sacrifice the box at all.
    – FreeMan
    Commented Jul 22, 2020 at 17:51
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I would like to suggest that, as with many things, it just takes practice. If you do it enough times you will learn just how much to hold the box proud of the wall surface when starting the screws - knowing that the screws will tend to pull the box into the wall cavity some as they tighten down.

When working in less than optimal positions such as under a counter it takes some additional skills as a contortionist and knowing when to bring in additional lighting.

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