Cut off lever isnt interacting ithtrigger switch?

[Boo-Sabum Ben]

Hi Guys, hoping someone can assist with a strange problem I'm having!

Working on a DMR with a cut off selector late to keep it in semi. But the cut off lever is not lifting the trigger contact, so stays in full auto.

I have tried the following already:

Different triggers x 3
Different switch block
different selector plate
different gearset

I have videoed it cycling. You can see the sector gear is hitting the cut off lever, but then seems to skip past it, and I cannot for the life of me fgure out whats wrong.

None of the parts show any signs of damage.

https://www.youtube.com/watch?v=vjl57QG_6yQ

Thanks in advance!

[snoop]

its the gear not moving the semi block. there are gear "delayers" but I would check that the semi auto block (the sprung thing) isn't warn. if it is, get a new one, it should always move the full way up.

[johnnyj]

Had this before mate, the cut off is not lifting the shuttle fully , you have been around awhile so must have have some old units try and compare them see if 1 has a larger profile , turn by hand to match the trigger and block