I’ve always had trouble putting up trim. I know it takes practice, but it usually takes more practice than I have trim in the target room. One of my biggest problems is measuring mitered joints correctly. I don’t trust my measurements on angled cuts, and so my usual method is to mark long, then nibble away 4 or 5 times until I get the perfect fit.
The Miter Aid, made by Trim Clip LLC, looks like it was made for people like me who occasionally do trim work, but never enough to get really confident. This made-in-the USA tool clamps on the end of a piece of trim that has been cut with a 45° miter, and provides a secure hooking point at the inside corner for your tape measure.
The Miter Aid will hold the end of the tape in the correct place while you mark the measurement. This should be really helpful when you are trying to use a tape measure with casing longer than your arm span, and helps to eliminate the need to enlist a helper or grow an extra set of arms.
Not only is Miter Aid useful for measuring mitered pieces, you can use it to mark 1/4″ offset reveal lines.
Trim Clip markets the Miter Aid as a part of a complete solution for framing trim around windows, doors, and other openings as shown in the above video. They make it look easy, here is their process:
- Use the Miter Aid to mark 1/4″ reveals
- Measure the horizontal and vertical distances between the markings
- Make the left 45° cut
- Use the Miter Aid to help measure out and mark the second cut
- Make the right 45° cut
- Repeat steps 3, 4, and 5 for the remaining three pieces of casing
- Hang the trim using the reveal markings
Of course, they don’t tell you what to do if your opening is out of square.
The best pricing for the Miter Aid online is at Amazon where it’ll run you $15, or you can buy it locally at a Rockler for about the same price.
Miter Aid isn’t the first and only tool of its kind that’s designed to make putting up casing easier. Bench Dog and Milescraft sell similar tools that are slightly cheaper, but they don’t seem quite as easy to use.