If ever you are foolish enough to drop a tenon saw down the back of a radiator, the way to retrieve it is not in the morning with an S-hook on a piece of string because the string snaps. It's not at lunchtime with a J-hook whipped round the screw thread onto a stronger piece of string because the string snaps. It's not mid-afternoon with a chain with a hook at the end because the chain gets jammed. It's not by trying to prise it out in the late afternoon with two cross-cut saws because it gets almost all the away up then falls back in. It's in the evening, with one of the three thin chains from a hanging basket. 

In between times I made a bench out of three long pieces of shelving and the side of an old chest of drawers for my computer and my sewing machine.

One day a radiator remover will be very surprised when lots of bits of snapped string, three hooks and a chain or two fall out onto the floor.