Fair enough - that is what I would be doing with an unknown circuit. Problem arises when you have coils or transformers involved which may only have a few turns of wire between the pins - so the meter says they are all joined together. This is true but...
I am guessing that your two switches just short out part of the tuned coil windings on medium wave - perhaps you can confirm - if the switch is marked M/L?
BTW its great to see someone sticking with a job like this - you would be surprised how many give up after one post and ten answers.
