Thanks for the repley but removing the blade is not the problem.
After removing the blade then there is a block of steel on the end of the axle (where the blade was mounted on). The block of steel looks like a big nut (4 cm heigh) and its diameter is bigger than the seal. I have to remove this before the seal can be removed. I tried all kinds of stuff but I cannot get it off.
Pieter
February 2006