Remove all eight screws of the upper and lower unit. Then you can take off the front part and replace the profiling rings.
NOTE:
Be careful there are o-rings behind the front part.
In case you do not have the spare profiling rings, we recommend you to order the profiling disc complete, with carbide ring:
order no. 009904 (without cooling) order no. 011123 (with cooling)
depending on your configuration.
