Good grief. The engine undertray cover on my car is currently held on by one screw on the front skirt. All the others are missing. It's got about four screw holes where it fixes to the front skirt but it's damn near impossible to see where it is supposed to fasten on to under the engine (given that I haven't got a ramp or trolly jack). There's no sign of any screws still in place from before I pulled the cover off so you can't tell what size/type of fixings you need! God knows how it was held in place before! And I can't budge the one screw that's still in place so can't remove the cover either!!!
I think I'm going to have to limp down to the local garage trailing the cover along the road so they can put it up on their ramp to have a look at it!