1.   Keycard systems hold a number of advantages over traditional cylinder locks for both the guest and the hotelier.

2.   Burglars often attack cylinder locks by gripping and turning the cylinder with a wrench to force the bolt back.

3.   Install double cylinder deadbolt locks on doors with glass panes.

4.   Yankee ingenuity has led to such important early inventions as steel fish hooks, carriage springs, shaving soap, cylinder locks and repeating rifles.

5.   The cylinder lock would pose no problem for a pro.