Simpson Tumble Dryer-Model 39-771-how to re set-up the drive belt pulley?

Hi guys, I am a mere female and have dismantled and replaced the blown element, my problem though is I cannot workout how the drive belt pulley reattaches correctly. I didn't take note exactly where the spring attaches etc. basically as I peeled the drive belt up and off the drum the pulley system dropped down/off, as I didn't expect this to happen I hadn't yet taken notice of 'how' for setting it back up? I have tried a couple of ways and the metal part which the spring attaches too is dropping off on me when I start checking that it is going to rotate ok.
I am totally stoked at this helpfull site. Hope someone has an answer for me.
Thanks, regards, Kay