I have a broken ultrafit rowing machine ( magnetic)?

Hello,

The same thing has now happened on my Ultrafit rowing machine.
The strap has now become completely disconnected. Upon opening up the rower it seems that there is a spring inside the mechanism which retracts the strap and this is failing to work.
I'm unsure of whether this can be fixed as it is coated in grease and I cannot see it entirely.

Mr Simmons
January 2015