I recently bought some new locks for my shed roller doors. I had a little trouble working out how to install the cylinder into the lock mechanism; whilst fiddling around I managed to completely and accidentally disassemble one if the cylinders - try and avoid this, bits ping everywhere!
I emailed the lock shop and one of their very knowledgeable staff called me back within a few hours and helped me though the issues I was having.
Great customer service! Thanks guys!