FX Impact M3 barrel lock nut (jam nut) thread size.

Can’t seem to find the answer online. Can anyone tell me the thread size/pitch of the barrel lock nut on the Impact m3? The part where the shroud threads onto it.

I want to try to make a stop/spacer to give my valve adjuster an extra centimeter of space. I can’t fully open my valve adjuster as the shroud is too close and only allows 3 1/2 lines before making contact. Thanks.

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