Prizing Seat Post Clamps Apart…….. to get it over the seat post tube ?

Any tips on how to prize apart or widen a seatpost clamp, without damaging it. I have a Hutch Donut in Chrome, so need to be gentle with it……! So, no hammer or screw-drivers !! LOL !! (I think I had the hammer/screwdriver discussion with S.B. Dan and Mr Stupps at Daggers recently)
Any tips then ?
