Card Made With a Gift

A friend was at a car boot sale at the weekend and found a large bag of stamps for sale.  As he knew that I was making more and more cards he decided to buy them. 

Last night I received the bag and had to wait until he had left before diving in to find out what treasures I had been given... there was a wide selection of stamps - most are currently heaped on my desk (WOYWW - Stamps, stamps and a few more stamps!)

I found one stamp featuring a lady that I decided to use straight away... I took a deep breath and stamped straight onto card, after colouring with ProMarkers I was pleased with the result.

Several of the stamps were cast in Rubber and had what looked like EZ Mount fixed to the back. 

It was not EZ Mount - the sticky stuff was not repositionable!!!  I tried to remove it from my stamp block and managed to do so without damaging the stamp. I know have to find the 'Sticky Stuff Remover' that might be in the kitchen to remove the remains of 'stuff' left on the block. I have stuck the stamp to a piece of OHP film until I am able to sort it out.

Quick question time - How can I remove the backing from the stamp so that I can fix 'EZ Mount' to the rubber stamp?????