1.The arm part which pinched leather used chestnut wood. First of all, cut along the length.

2.Next, Cut the width to 50 mm.

3.Polish the surface with a drum sander.

4.Mark the R25 semicircle at the root of the arm.

5.Cut the R section with a fret saw.

6.Finishing of the R section with a disc sander.

7.As one side of the arm to bent by the hinge, cut at the hinge attachment position.

8.Since the central part of the hinge is rounded, R3 chamfering process is performed on the plate with a router to escape it.

9.Enlarged picture of R part.

10.This is the part of the jaw that holds the leather attached to the tip of the arm. Carve a groove 50 mm wide x 3 mm deep to insert the arm.

11.For 45-degree chamfering process, cut using a self-made miter sled jig. Cut the beveled end of the arm in the same way.

12.The left and right jaws are complete.

13.Drill in the left arm for the claw nut. First, use a forstner-bit to make a 25 mm dia 2 mm deep, and then drill a 10 mm.

14.Screw a M8 bolt into the T-nut and clamp it with a vise. Yes,The nut can then be mounted horizontally.

15.Prepare the for hinge installation. Place the right arm on the left arm and clamp it to the workbench with a clamp.

16.In this condition, use the centering bit for the hinge to drill the pilot hole. In this way, the hinge can be mounted no miss.

17.Temporarily attach the hinges and check the movement.

18.Make hole for the lever quick clamp.Clamp the left and right arms with a clamp, first, Drill a 25 mm counterbore for the T-nut on the left arm, then drill 6 mm through on the left and right arms and finally a 10 mm on the left arm.

19.This is a pivot part to attach an arm. Make a step with 70mm and 50mm in diameter with chestnut wood, and turning the 50mm part into a spherical tip.

20.Use a router race to cut both sides of a 50 mm diameter part and finish 35 mm wide. Set the trimmer M6 on the router race and cut two sides with a 28 mm diameter bit.

21.Use this index to flip the work 180 degrees.

22.It was not possible to make the entire surface flat with a 28 mm diameter bit.

23.Finish flat with woodworking files.

24.The two faces are finished flat. After this, cut it to the specified length with the parting tool.

25.Drill an 8mm hole for attaching the arm to the cut pivot part.

26.This is the base part on which the pivot unit rides. Cut a 20 mm thick rubber wood laminate to the specified width.

27.A process to sink the head of the M8 hex socket head bolt on the back of the base. After a 12.5mm counter bore with a 20mm phossner bit, drill an 8mm through hole.

28.The stud bolt connecting the lever quick clamp was made from a brass round bar. First of all, M8 dice .

29.Cut to a length of 32 mm.

30.Making center hole.

31.M6 tap.

32.Turning the end face.

33.M6 tap while chucking on lathe. If the tap while pressing on the tail stock, It can tap to straight.

34.Completed stud bolt.

35.The right arm through which the axis of the lever quick clamp passes. Modify the 6mm hole to a 10mm slot so that the 6mm axis of the clamp can move.

36.This is the collar that keeps the coil spring in the center. Outer diameter 12.5 mm. Drill a 6mm hole.

37.The collar on the stud bolt side should be expanded to an inner diameter of 8 mm.

38.Put the collar inside the spring and set the lever clamp.

39.Knob portion of lever clamp. The knob can be turned to adjust the gap for gripping the leather, and by pressing down on this lever it can grip firmly.

40.Non-slip seat to stick to the jaw part of the arm tip. It is a silicone sheet with a thickness of 1 mm and an adhesive.

41.Stick to the inner part of the jaws.

42.Attach a non-slip seat to the back of the base plate so that the pony does not move during work.

43.View from the folded top.

44.View from the front. It seems to be able to be stored compactly than I thought.

When working, fix the arm at about 60-90 degree.

If you work at this angle, the thread will not get caught in the handle of the clamp.