Hi, I recently purchased a Bi-Fold door from a very large DIY outfit in the UK. Needless to say the instructions were poor to say the least. I am having terrible trouble fitting the spring closure unit. It says fit the unit into the track at the closing end where it will opertae between the jamb and the pivot roller to grip the door closed. I have two springs of different length, a plastic clip with a hole through it (which I assume the spring goes) and another plastic clip with a loop on it. How does it go together? As I cant get anything to clip into anything else! Thanks