I imagine that Geringhoff does have a web site, but I don't know the address.I do however have the phone number of the U.S. distibutor, which is Willmar Farm Service 800-333-8300. I have an older version that is called the P.C. it has 1 stalk roller and a set of stationary knive that the stalks are drawn through. It does a real good job of shredding the stalks, in fact it does better than my flail chopper, but it does leave a longer stump. The down fall of this head is the power requirement. The new heads are the R.D. model (Rota disk) they have two stalk rollers and a third roller that has a series of rotating cutters that do the shredding. The job of shredding is supposed to be similar but the power requirement is said to be quite a bit less. Unfortunately the RD head is quite expensive, about $40000 for a new 6row. Repair parts are also quite high although the heads seem to be quite robustly built, I had no troubles with the head proper this year, just the drive belt on the combine. Hope this helps, m.i. nuts
