In the meantime, I keep returning to the naturals. The photos below illustrate a little scoring jig I built based on a simple plan from Mr. Miller's eBook Most Excellent. I purchased the metal bar at Home Depot and cut it down to size with a hack saw. The jig itself is made from parts and pieces I had laying around the shop.
The bar is 1/8" deep; thus, the first score is at 1/4".
And voila! Both scores are accomplished and I can get on to notching at the first score. You'll see what I mean in the next post.