I've been working through my 'troubled' cameras. Re assembly of the repainted Trip, clean up of the new Trip, new light seals in both, batteries for the Mju:[ii] and 35RC, experimental in the latter. Now Pentax MX No2. The dreaded battery drain. Batteries only last a couple of days. Annoying but supposedly easy to fix. You just have to bend a little electrical contact a bit. So, I removed the base plate to find the most amazing precision mechanism. It's a completely mechanical camera - the batteries only power the meter. Wind on and fire the shutter to watch all those little cogs and levers interact. It's beautiful. All re assembled now. If the meter still works this time next week it's fixed.