Broken and missing knob replacement

I had a problem with a missing knob on the feed box for my lathe. The previous owner used a drift punch in the arm to lock the selection in. Attachment 11402
This just don't cut it on a machine designed to make parts.
Looking thru my junk stuff pile I found a 5lb dumb bell with a knurled handle. The weights unscrew from the handle and a file test told me that it was easily machinable.Attachment 11403 Attachment 11404.
Hack sawed off the threads on one end and chucked up the handle. Drilled to size and depth for the arm and cleaned up the ends. Next problem was what to use for the engaging pin. A hinge pin seemed to beAttachment 11405 the perfect fit.
The end was cut off the right length to retain the flange in the arm when the pin was completely engaged. the cutoff end was then welded to the back of the flange. Next was the spring. A salvaged spring from a destroyed china bb gun was the right size. A 1/4" pipe nipple was cut off and threaded and screw driver slot put in to install the assembly in the arm. A side hole was drilled and tapped in knob and a set screw installed on the shaft.Attachment 11406
Cheap and dirty works for me. While doing this knob I decided to make a new knob for the elevation knob on the tool post grinder that was broken. I turned, drilled the 3/8 bore and removed from the lathe. Drill press and x block for the retainer pin hole and installed.Attachment 11407 Attachment 11408
I think I'll get 2 or 3 more knobs from this handle. I wish people would throw more of them away.