Alt Beer wrote:
The glass in an external wooden window frame is cracked and needs
replacing. The putty at the bottom of the frame is cracking and easy to
remove
but the putty at the top and sides is rock solid. What is the best
way to remove hard set putty without damaging the wooden frame?

Thanks

Smash the glass out - seriously, try to do it in large pieces to make it
easier to handle, and once it's out, you've got an edge to work with.
An old wood chisel is about best for this job