Thanks for all the responses everyone.
To answer a few of the users' questions:
1. I tried pushing the knob down but it will not push down any further.
2. The knobs are not push/pull knobs.
3. Not sure if I'm confident enough to adjust the height by going through the control cavity but I appreciate the info.
It looks like lowering the tone knob might entail a bit more work than I feel comfortable doing on my own. I'm not that OCD about the tone knob being slightly higher, so I'll leave it as is. Who knows, maybe it is "historically accurate"?
Thanks once again for everyone's input.