I have had this saw for many years. I do not have to change the blade very often at all. I am trying now and I cannot get the blade to tighten on the shaft. I believe there is a shaft lock button that I cannot find or is broken. Can you explain how to change the blade? What am I doing wrong? Thank you, I love this tool. I only have very limited use of my left hand/arm. This saw is well balanced making it usable by me.

I just read the responses below. I probably have the needed wrenches if I knew what they look like?

Don