DIY & Home Improvement

little slots on the plate. On jigsaws they tend to be kinda flaky, but can work if you are really careful.

https://www.homedepot.com/p/Milescraft-SawGuide-for-Circular-Saws-and-Jig-Saws-1400/100507166



I'd say 10 bucks well spent.

Lumber sizing basically sucks-- nothing is really 1" or 3/4" and a 2x4 isn't even close. If you're building from scratch you deal with it, but if you actually need something 3/4" thick you either go to some place that does millwork and pay though the nose or you get plywood. Last I looked, 3/4 plywood is really 3/4 and where ever you get it will cut it to your size. It's reasonably strong, too, but you can easily glue or screw a small strip underneath to strengthen it even more.

Option 2, of course, would be to just get some decent lumber and make the whole shelf from scratch.