I ordered one of these new key options for the 100 series, and I really like it. You can use the metal part from the old broken key shells in this, so you don't have to go get a new key cut. Since I haven't thrown any of the broken keys away, I was able to set it up in a few seconds. So far, it feels sturdier than the normal shells, so I have high hopes it is going to last for a while.
https://www.amazon.com/gp/product/B01LTCIR70/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01LTCIR70/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1