no set screw on blower wheel in Sanyo wall unit?

Hello,

I have vibrations in one of my units for a Sanyo mini eco-i VRF systems (a KHX1852) and suspected it’s a dirty blower wheel. Not a hot day today, so I went about it, fully educated by youtube videos. However, my unit’s blower wheel has no set screw and I can’t get it out! It is really dirty and begging for the garden hose. I am waiting in line for Panasonic support now but fear it might be too late on a Friday afternoon and I am screwed. But perhaps you know the trick? I’ve searched this online in all possible ways but only dead-ended. Given the dirt on this thing, and the missing set screw, I would expect this to be a more popular question…

Try calling a contractor?

Is this a “real” VRF.
As in, you are in an apartment or condo, and everyone else is tied into the same outdoor unit?

If so, stop. seriously, stop.

If you knick a coil, you are talking about in the high thousands of dollars in repairs.