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I use a washer on one side of the blade. The back side has the vertical part of the coil spring in the way so it rides on the tang. Keep in mind there is a "post" there and not the full inside of the liner. The liner could be relieved a bit similar to what some of the slippy guys do to prevent...

Using the pattern I have drawn up something that looks like the back bar. Clamp the pattern and drill it. drilling. This is with the #49 that matches this template and is the tapping size hole for a 2-56 screw. Here the holes are drilled and I draw in my cut lines generously oversized...

I will add a groove to the blade to give us some additional pocket space for the coil. You could always skip this and put the entire pocket into the bolster but the knife will be thicker than it needs to be. Putting a small pocket in the blade helps keep the over all knife a little thinner. The...

Ready to mill in the blade torsion coil spring pocket. I will hold this down with a tool plate since it will be too much to hand hold in the drill press. You can make your own or https://usaknifemaker.com/knife-dogs-tool-plate.html I use a Precision Mathews PM25 mini-mill. Highly recommended...

I use this stuff all the time to hold work for engraving. It’s handy. I have not seen it used to get a profile before and I will have to remember that.

Here the bolster is aligned on the liner. The pivot pin has just a touch of oil on it to keep solder from sticking to it. The drill bit is pushed into the blind hole to get it exactly where it should be. I had to redrill the blind hole and ream the pivot hole to remove solder. Easy peasy. Once...

none that I am aware of.

The liners and bolsters are drilled. I am pointing to the blind hole I mentioned earlier. This will be used for alignment. You could always drill these holes out for screws to the bolster also. I wanted these ones hidden. On my last build I drilled these out and later plugged the holes with a...

The pattern is clamped to a liner side and scribed around the edge. Use blue dykem layout fluid but some guys use a sharpie or other marker. Leave it clamped and drill through the template with the right sized drill. Burrs really screw things up. These burrs are really bad as the drill bit...

The pattern is out of heat treat. Now it's time to select some materials. First I need to know the height and diameter of the torsion coil spring. This is called a snap gauge or snap caliper. Very handy and it is usually the first thing I grab when I need a quick measurement. Calipers are...

First, math is a liar and I avoid it as much as possible. Second, nice build. The lock bar only has to function in two places and the rest of the time it just has to get out of the way. Also, the lock set in open and closed is not 180 degrees opposite on the tang. They are just arbitrary points...

It was but some inkjet printers will work also. It just depends on the ink the printer uses.

I keep a block of g10 on my drill press with the drills, reamers and spotting drills I tend to use. This one silly holder has saved me hours and hours of searching for drill bits and keeps mistakes down.

Since I have accumulated a bunch of these drill patterns I've learned to scribe in the pattern name and indicate what size drills to use. Here I am only using a #49 drill so it saved me some time by not marking all the holes. Both the blade and the frame get a pattern name so they can be matched...

Time to profile. I'll grind right up to the outside edge of the line. If I have an inside arc anywhere on a design I try to make it match one of the small wheels so I can plunge it evenly. If I don't get the arc right in the design, I'll usually make a change on the fly to match a small wheel...

This is a duplicate post from my thread in the "Automatics" sub forum on building an auto. Say you have a pattern hand drawn on paper. If you have a printer with a scanner you can easily transfer that sketch to your steel. Even if your sketch is too big for the printer scanner, you can scan in...

I saw a post by a knifemaker recently that also engraves. I wish I could recall who it was and credit him for the reminder but here it is. Engravers use several methods to transfer a sketch to the work piece for engraving. Below I have the printed out a pattern and cut out the blade and frame...

I managed to get a few done in 2020.