Bit more work this week, though not as much.
The hinge fits both the submicro and normal microswitch. They have a different feel to them. The submicro is very light but the standard is pretty solid. The front screw for the grip is just in the right spot to act on the micro switch. For the small switch an 8mm screw is about right but for the fill size the standard 6mm is the one you want. At least I think, I need to mount the hinge to the under barrel to be sure.
The mounting is slightly different between the 2. Both use M4 grub screws, the smaller just one in the middle and on the larger 2 fit into the mounting holes on the microswitch.
It's a little more visible than I'd like when the front grip is hinged down but given you'd probably be holding it I think it should be okay. Maybe swapping to a non-lever type could fix this, but may need a little "button" added to the grip. The screws will face "in" towards the body so even when hinged down they shouldn't be super obvious.
I also hit a wall with the audio on my effects unit. Basically unless something is already playing the lag on DFPlayer Mini is far too long (between 0.5 and 2 seconds). I spoke with some one who knows what they're doing in this field and they said they spent ages trying to work around this a while ago and didn't find one either, so went another route.
So another route is to be taken! I have picked out some new parts, which I have yet to order as they are a fair chunk more expensive than what I was using. Well the main board is about 8x what the nano clone costs, the audio board isn't actually too bad.
News when I get further I suppose.