Levi, you're the kitter and it's your business if you want to change your designs, but IMO the spar works like it should, is simple in design, and even if you don't own a Dremel with base it's really no problem to cut the spar slot out with a sharp nr.11 blade and a straightedge. Just make a couple of v-cuts and round out the slot by dragging the spar material through it. If you do own a Dremel and base you can do a lights out and speedy job of it.