04-04-2019, 10:21 AM
May I suggest shortening the brackets to maintain the position you want, with longer bolts and thick rubber washers between a flat washer under the bolt heads, another between the bracket and the tank, with a third the other side of the tank mounted bracket with another flat washer and a self locking nut. This will require longer bolts but will give the slight flexibility you are seeking. The rubber washers might well be made from synthetic rubber gasket material available from engineering suppliers, say 4 to 6 mm thick.
Robert Leigh
Robert Leigh