You drawing is to scale Í assume. The dimensions given in your drawing don't fully define the tool. Its missing info on the handle as well.
Insert that picture into a sketch, draw a line in the sketch exactly the length of the 127 mm dimension. Measure the length of the line,
then scale the picture by measured length : 127. After you scaled the image you can trace it and get a close approximation. The dimensions you are missing are not critical and your image is of good quality and should get you what you want.