In my favorite online bike store there was no chain whip on stock, so I have made one myself. I needed a steel band (see the other piece) and a piece of steel pipe remained of the house building, and an old chain. I used a cheap chain tool, pliers, a hammer, a drill, and an angle grinder. A locksmith acquainted with me has welded it for free.
It works great.
If I will have a grinder, I will make a curve under the chain.
Magyar