From Josh Lloyd…
This is a tutorial on how to make your own slider dolly for a GoPro, or really about any camera or phone (as long as you have the proper mount for it). It has adjustable legs to adapt to uneven surfaces. The one I make is for a GoPro. I'm using a ball bearing drawer slide I bought at Home Depot. It comes with 2 slides.
The parts you will need:
4 X 1/4-20 wing nuts $1
1 X 1/4-20 X 1/2" pan head machine screw $1
4 X 1/4-20 X 2" carriage bolts $1
4 X 8-32 X 1/2" pan head machine screws and nuts $1
4 X washers that will fit the 8-32 screws (optional) $1
1 X GoPro tripod mount $2
1 X ball bearing drawer slide $14
8 inches of 1-1/4" X 1/8" flat steel or aluminum $7
1 X cabinet knob pull OR just a machine screw with 2 nuts. This will be mounted on the end of the slider and used to pull and push the slider.
The grease on the bearings is fairly thick and creates a very smooth glide. If you get dirt, metal, or any kind of debris in the bearings throughout this project, you will have to spray them down with WD40 to remove the grease, wash off the WD40, and then re-grease them with some kind of grease. Preferably not a thin spray. I tried this first and it made the slide not as smooth as it originally was. After using a thicker grease, the smoothness came back.
If they feet are too slick, you can always buy some self-adhesive rubber bumpers that stick to the bottoms of the feet.
To release the center part of slide so you can work on it, pull it all the way out and you will see a skinny black plastic lever. Just push that down and continue to pull out.
I will try to answer as many questions as possible if I can.