My Granddad made a 2 1/2 inch Dyak in the 1930 and I inherited it a very long time ago. I have never had the time before, but as I am now retired I now have that opportunity.
While I believe I am a practice person I have no engineering background so have a great deal to learn. I am in the process of joining the nearest engineering club with a 2 1/2 inch track and feel they and this site will help me out.
Robert