My bath has some awful instructions. I'm trying for to fit the feet, but it's not very clear what to do. It appears to show using 16mm screws to fix a metal frame to the bottom. There are no pre drilled holes or markings on the bottom to go by, and the bottom of the bath is very difficult to screw into, making me doubt it's right. I've attached a picture of me holding the frame roughly where it says to screw. Does it look right or wrong to anyone?