Arggh, the package to Canada came back twice because of corona related delivery problems. I think it did not even leave Germany. Refunded the Canadian, readvertised it on the bay and sold it again, this time to Northern France. I wonder if it was someone from this forum?
Just pull the video board gently towards the rear side of the Mac and maybe do a tiny bit of side wiggling while pulling in order to pull it in several little "mini" steps.
In fact I remove it as a habbit almost every time I do something in the HDD- and floppy drive connector cable area.
I have a kind of trauma, because I broke the neck of one of these precious old 9" crts once, when I was so caught in pushing the SCSI cable into the logicboard socket, that I did not realize that my forearm put some sidewards pressure on the video board.
Sometimes I still wake up in the middle of the night, hearing the hissing noise of the lost vacuum...