To replace the front road springs on a W210 E Class model you need a special spring compressor
This consists of 2 plates that you insert at the top and bottom coils of the spring - a spindle is then inserted through the hole in the lower suspension arm between the 2 plates to compress the spring which allows the spring to be removed & replaced.
We use a special Mercedes Benz tool but there are aftermarket tool suppliers that make these
See here for details of such a kit: Mercedes Spring Tool
Do not try this without the correct tools! The spring is under a very large amount of tension & could be very dangerous to try to remove without the correct tools!
Best regards, Paul