Robin,
Much more information needed here for this brain to figure out what you are asking.
I have never seen an escape wheel with weights before. Do you mean balance wheel???
If you do mean balance wheel what weights do you want to remove? Timing screws? Poising screws? They both usually have screw head slots in them but not always. If no screw slots then a small pointed pin vice has worked for me. Can you give more detail here?
Best,
Phil