Very nice Gil, I also noticed the hold down flange for the firebox & chimney stand also unique in that they are not cut at 45% and are bent straight out and rounded over. the windings have been formed on a hub that is generally press fit over the shaft since inception I believe. i just made a video the other day about modifying current tube production sight blocks to fit the button style early 9/32nds screw.
https://youtu.be/ZnUmU9cjBLE?si=VLr1Gxm64TYME1L_