The sight is very simple, and hardly needs instructions once it's described: It's just a rectangle of acrylic mounted in front of the riser, and the sight points are marked with a fine-tip wet- or dry-erase marker. Took a lot longer to write up the instructable than to make it.
You can color-code for different users of the bow or for different arrows or for field points vs. broadheads. You can put in sight points for all the targets in your club's field course, and even use one side of the acrylic for your permanent default sight points and the other side of the acrylic for wind-adjusted sight points. You can write distances and other notes beside your sight points. And all this at little to no cost depending on what you have in your scrap box.
NOTE: There is at least one potential safety issue, which is that perhaps if an arrow jumps or shatters and hits the sight it might ricochet at you. Don't use crooked arrows and always test carbon arrows before use. USE THE SIGHT AT YOUR OWN RISK. If this is a worry to you, don't use the sight, or maybe use undercut plastic screws or a weak glue (e.g., hot melt) to attach the plastic sight to the plywood mount for a more controlled failure.
I designed the sight for a recurve (a 66" Samick Polaris, 26# @28"), but it might work for a compound, perhaps with some changes. I'd love to hear if you got this working on a compound.
- Piece of clear see-through plastic that's rigid enough not to bend noticeably in the wind when supported by one side and clear enough that you can easily see what you're shooting at through it. I used 1/16" acrylic from some old Melissa and Doug toy boxes. The exact dimensions depend on how much adjustment range you need for your bow. My final sight is about 3.7 in x 2.6 in. If you can't find any acrylic sheet you want to sacrifice, you can order acrylic or polycarbonate sheet from Amazon.
- Piece of 3/8" - 3/4" plywood, big enough to cut about a 2 in x 4 in rectangle. Better quality plywood will reduce warping and thus reduce the need to re-adjust the sight. I used scrap 1/2" Baltic/Russian birch.
- Either: Two #10-24 screws long enough to go through the plywood and anchor to the sight threads on the bow. (If you don't have sight threads on the bow, you'll need to put in a threaded insert, or just use wood screws to mount directly to the riser.) The screws I had were too long and I had to trim them.
- Or instead for greater safety: Hot-melt or other weak glue for semi-permanent attachment of plastic to wood.
- Two small wood screws
- Fine-tip dry- or wet-erase marker. (Fine-tip dry-erase markers with a built-in eraser might be the best.)
- Kleenex or paper towel
- Optional: Different colored of markers for multiple users
- Optional: Stickers instead of markers.
- Optional: Wood finish, paint, camo fabric, etc.
- Optional: Washers for the wood screws
- Optional (if you want to get a better idea of placement and size): Toothpicks or wooden matches, masking tape and target.
- Safety goggles
- Metal ruler
- Box cutters
- Sand paper / flat file / sander