Peugeot 207 Key Fob Spring Broken?

My key to my Peugeot 207 (06 plate) fell apart in my hands last night and thankfully someone was able to drive out to get my spare to me.
Its just the spring thats gone as when I put the key back together the electronics still work for opening the car, the key just sticks out, but if i fold it back into the casing I cant get it out as the little silver button wont let it spring back out.
Can I replace the spring without going to the dealer as they cost a fortune.