how do i make these compensating plates flat? i have tried every approach i can think of. is it even possible? it is totally round so if i do a "square" sheet and then cut it round i can't work out how to make to curved to match the tank again! it has been driving me nuts for days now. i can get the part to look right but then when you come to detail it it is a MAJOR PITA to detail. any help would be great thanks.