I listened to the explanation and thought it would be a good idea to take it a little slower.
If the hatch does not open and the gauge does not promote elasticity, try clogging your nose.
It's a good idea to do it slowly and gently.
If you can not distinguish it, put a bit of bone chip in the entrance and try it.
If the result is not perforated, bone graft + sinus lift can be performed by additional procedure while promoting elasticity with gauge.
In my case, the moment the hatch opens (when the reamer is tilted) stops spinning, fills the bone chip with holes and condensing.
If you advance the hatch reamer 2mm further, the hatch opens fully and safely raises the maxillary sinus.
At this time, you can feel the elasticity by promoting with a gauge.
Expect good surgery.