There is no selector plate in a P90.
The way the trigger works decides if it is semi or full auto.
You need the slider that goes inside the front-most part of the trigger group. It is pulled by a spring and it is the cut-off lever that disengage it so only 1 cycle is made.
If you open the trigger, it is a plastic part that holds a little copper block. The block slides back and forth with the trigger and makes the contact between the two tabs at the rear of the trigger.
You have to source a way to get some stock TM parts, as this is the only replacement.
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