It's been a while .....
My memory has these being mounted on bases ? Used for display. We did a number of other "bugs" for this fellow as well, l was Really taken by the size of the beetles.
I'd guess the formaldehyde altered the organic structure of the beetle too.
I vaguely remember we had to
Let them sit for several weeks ( drying out most likely).
Lesson... Don't write when you're tired ...
Then have to edit the next day...