Problem with toggle switch on Magnum Dynalab tuner

If it is like my MD90 all you have to do is remove the top plate to get access from the rear of the switch and tighten the nut that holds it in place.

Thanks for the advice. I popped the top, but all connections were tight. So, I thought to clean the contacts of the switch. A little Kontak and ... voila, it works like a charm. Sometimes, it's the simplest things that require correction.

I have a Old stock Etude and I like to know how to disassembly the toggle switch since the tips are more wide than the nuts. So how to pull out the nuts? Thanks for any information.

 Good to hear that worked.  I have a 102 and it's a great tuner.