I'm hoping to lean on the expertise of some electrical gurus here to help troubleshoot, or at least give advice for the best direction for repair.

I have a vintage Delta Unisaw 34-450 (year unknown) that has had some occasional failures to start before this, but repeatedly jamming the 'off' button or unplugging the machine allowed it to start eventually. It's 1.5hp, running on 230v.

Yesterday after using it briefly, it decided not to start again.

I took apart the physical switch, and blew it out; there was a fair bit of sawdust inside. I did the same with the control box, again it had some sawdust inside. Once reassembled, I plugged the machine back in and: the saw fired up, but only as long as I depressed the switch. It shuts off again when the 'on' switch is released.

I can recreate the above scenario by repeating the same steps, but only briefly. After one or two 'on' cycles, the motor will refuse to start again. I did find a loose wire in the control box. The red wire (see attached control box photo) connected at bottom right of the [coil?] was loose. I removed it, reshaped the wire strands (it was flattened), and tightened it again. Same result as before.

Electrical repairs in machinery is not my forte. If there are available parts that I can replace with like-for-like, I'll do that. Or if I can replace the entire switch assembly to an updated version, I could maybe do that.
Alternately, if necessary, I guess I could find an electric motor shop that is willing to work on it. The latter is not my favorite option, not because I'm money-shy, but because I don't relish the task of disassembling and transporting my ~300lb saw. Are there repairmen for this kind of thing who will come on-site?

Thanks for any help.
control box.jpg
switch-cover removed.jpg