I purchased two foobler feed balls after seeing the advert and endorsement from Dr Harry Cooper. They are cumbersome, hard cheap plastic, very awkward to unluck for small hands and the thread mechanism on the key unlock system is worn after one week to the point of just turning continuously so that it can't be used. Useless load of cheap (probably made overseas) crappy plastic.
Also the bell system is so inadequate you can hardly hear the tiny tinging.
A GOOD IDEA But CHEAPLY MANFACTURED FOR HIGH PROFIT
I WOULD RATHER PAY MORE FOR HIGH QUALITY.
So much for supporting local Forget it buy cheap stuff from The Reject Shop instead.