[Cr0nik]

Hello,

I think I've diagnosed a problem in my V2 AEG mechbox and I'd like to ask for any advice on how I might correct it.

Background:

I bought a used/working V2 reinforced mechbox with preinstalled internals to replace my old stock one (trigger "post of death").
I swapped out the main spring and now I'm having trigger problems.
It seems the trigger, trigger switch, and cutoff lever are not meshing properly.

Description:

The trigger contacts are disconnecting prematurely before the piston can fully cycle.
The trigger is slipping underneath the trolley, and trolley is riding up over the trigger as it is pulled.
The cutoff lever is moving with the selector plate, but neither the trigger or cutoff lever are able to hold the trigger switch closed long enough for the gun to cycle.

Pulling the trigger completes the circuit momentarily, the gun begins to cycle and then I feel the trigger "break free", losing contact with the trolley, and the trolley resets immediately.
The whole thing produces a loud "click" as the trigger slips under, the trolley snaps back over, and then another smaller "click" upon releasing the trigger, when the trigger resets and has to force itself back underneath the trolley.

I've disassembled and reassembled it a few times now and observed the above occurring.
This was with only the selector plate, cutoff lever, trigger switch, trigger, and trigger safety lever installed.

Basically the trigger trolley looks like its "rocking" or "doing the wave" instead of moving straight back and forth.

So what gives?

As far as I know they're all the same stock VFC components, and were previously meshing together fine.
I've examined the parts individually and they don't appear damaged or worn. I can only conclude I'm making some rookie mistake reassembling it all.
I've watched several hours of mechbox tutorials now I can't tell what if I'm doing anything specifically wrong.

Is there some well known or common reason for this problem?
Can I shim my way out of this?

P.S.

I should mention I read the sticky on "Semi-Auto Seizure" and I'm not sure that's the problem.
The trigger is slipping under the trolley on auto as well, without the sector gear installed, and without the cutoff lever engaged.
Unless... could this be because I'm installing the trolley with the cutoff lever in the wrong position?
On auto I can see the cut off lever "up" and disengaged from the trolley, but the trigger can't hold the circuit closed.

When I pull the trigger on auto, the cutoff lever should NOT be engaging the trolley?
and the contacts should stay closed, held together by the continuous press of the trigger... right?