Dear Herman, thanks for the reply.
Those 2 links are just referring to the introduction video for the forehand solution 2.0: ball machine or hand feed
I am not shure, if this is correct.
Concerning practice with a ball machine: We have a broken ball machine in our club. I will repair it, so I hope in due time, I can practice with a ball machine at least once a week. But realistically, until we receive the repaired machine it will at least take a month.