Is it possible to have two 240V circuits on this main breaker lug?

[James L]

I'm not at all embarased to show them at 58 year old panel and say I'm just trying to make it work safely with today's available equipment.

That's part of what makes a good electrician, imho. Being able to say y'know what? Out of all the less-than-ideal solutions, here's the one that makes the most sense.