If you are flying geophysical survey in a 210 then it alters the dynamics somewhat. Going high isnt an option, and if you slow down too much you can risk driving into the side of a hill.
Put your drink bottle on the seat next to you. If said drink bottle is regularly floating around the cabin, and you are also feeling those sickening big thumps every so often that are a bit painful, its time to go home....so go home!! The survey lines will still be there tomorrow to fly when hopefully it isnt so rough. Especially if it is my survey plane you are flying, they cost too much to fix!!!!
On another note, everybody worrying about the wings falling off may want to take a closer look at the tailplane of their 210. It will give up first you will find. My 210 has had its tail rebuilt 3 times now but the wing has only broken once.