discrete sawtooth generator circuit

I found this circuit:

on this page:

https://www.learningaboutelectronics.com/Articles/Ramp-generator-circuit-with-transistors.php

it simulates nicely:

Unfortunately I was hoping that the tooth would start closer to zero.  A ramp starting at zero makes it more useful for applications like diode sorting.  But that two-transistor SCR used to quench the cap voltage is probably the culprit.  More investigation will be required.

Later I found this video by W2AEW explaining the circuit in detail:

And even later noted that the 2 transistor configuration is not an SCR but a programmable uni-junction transistor - last mentioned here:

https://wb9kzy.blogspot.com/2023/06/2n6028-programmable-unijunction.html

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm