However, this attachment could not be used as supplied.
Reason: During thread in the bottom of the food dispenser is a M20 thread, enclosed was a made of plastic screw threaded M18.
Since I ordered several copies of these plates, to retrofit all my transparent feeder of the brand "GARDMAN" order, which were delivered with a sämtlichst M18 screw, it can not be an isolated mistake of the manufacturer at this lapse.
In order to spare me several times back and Hersenden the claimed article, I resorted to it, to wind the thread of the M18 screw with a few turns of Teflon tape until it could be tightly screwed into the M20 thread of the feeder.