Ordered a pickguard from China - wanted a black one rather than the red tortoise shell standard VP one.
It arrived a touch bent.
Tried weighing it down with a bag of sand and while it improved, still some significant deviation.
So.. here's the trick to fix one...
1. Take off all the protective plastic - you're going to cook it and I'm not sure how it'll go in the oven.
2. Heat up an oven to ~100 deg C. Mine's fan forced, but around that temp - don't want too much more.
3. Place as flat as possible on an oven tray - I ended up using 2 as the VP is a big pickguard.
4. Put in the oven.
5. Watch it - took me 3 minutes to get flexible enough to lay flat.
6. Take it out and weigh it down with something heavy(ish). I placed a sheet of greaseproof between the phone books and the pickguard.
7. Leave 10 minutes and viola (or more bass! - sorry, terrible joke).