I could see flexing when I bounced the motor on the trailer, (place foot on ride plate, bounce) Then I took the transom cap off and same thing, I could easily shove a 1/16'' metal pin down 10" anywhere I tried!
This thread shows how 'do-able' this is. Helps if you have a nice garage/shop I realize. I removed my Yamaha F90 and hung it from the rafters in my garage, If that's more than you wanna do you can take it to your marine mechanic, pay them to R&R/store it.
Here's the fish.
If it is the one from Elsner's, It means a lot to me. Some of my early memories( I was born in 1973) is of my Grandma carrying me around the big cottage, showing me the 3 mounts on the wall, there was a big Walleye and a Smallmouth.