BTC Spectre, selector plate issue

[Sir Stephen]

just installed my spectre get, everything is working fine aside from the selector plate being in the incorrect place to activate semi/full auto.

at the moment:

safe is safe
10 O'clock is semi
and just slightly past semi (a mm or 2 at most) is full auto

Can anybody recommend a brand of selector that they use which they know works properly? (I'm currently looking at a lone one, have tried a G&P and i am using a spare ASCU one i had as we speak)

i play mostly semi anyway so i can still use this for skirmished as it is now, but i wouldn't be able to to use full auto if i ever needed to atm, the selector just dosnt stay in place for it.