One of the screws that hold the tank down on the Mars Pro seems to have disappeared into the great beyond. I searched for it for a while… even dug thru the trash. However I have not yet found it. I’m going to work on something else and come back in a bit and try again, but I’m not optimistic. We have replaced it with a long M4 and a couple of nuts that work fine as a temporary fix in case it turns up,
but it’s obviously not an ideal solution.