Pulling these apart is a bit of a task, meant to be kid friendly in that regard.Thinking things through a little, by use of a screwdriver then shoving one of those plant labels to stop the tab clicking back in could be a good solution. From memory there are multiple tabs to release to get the top off hence the plant label option. Stiff plasticard or small metal strips could work just as well. As for the diode setup,
PaulRhB
‘s article is somewhere in here, will try hunting for it and put the link in here.
Aha found it. But sadly looks like the thread pics have been removed. However his Flikr pages very interesting, not found the PM Mod pics but may be in his Workbench Album of 800 pictures, not ventured into that.
Nice one Paul! Rik
www.gscalecentral.net