In hind sight I just had another idea.
Before you pull out the old mechatronic sleeve, you get some of your wife’s pink nail polish. If she doesn’t have any, just ask your girlfriend.
Now place a line of pink nail polish on the old sleeve (see picture attached).
Take the old sleeve out. Line it up with the new sleeve and put a pink line in the same place on the new sleeve. Now you know exactly how far it should be pushed in.