You don't have to pull the plunger tube. (EVER). You just pull the safety and usually the spring and detents will fly out the back. Sometimes a bugger to get back in actually. All it takes is like a dremel to make the notches in the safety itself a bit more pronounced.
I also put the notch in the take down lever on all mine. None of them had it I don't think, maybe the CBob did, don't recall.
A youtube video might be the ticket. It's kind of intimidating but really not difficult. I'm not a natural at it and do worry some taking them apart but always managed to get them back together and functioning. Like any gun, function test everything every time.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."