I have never had this happen to a SW tank because I am new at it...
I have had it happen in a FW tank though, I used one of those long poles that bend for picking up nuts, bolts & tools when they fall in around your engine while working on your car (hard to explain - go to the link). As far as the blade not being magnetic – test another blade that you have in the pack of blades on a magnet & that will save you some time...
Hope that helps!
https://www.expeditionexchange.com/t...n001%20041.jpg