"Easy to fit especially if the rack bolt is already fitted. Just remove the escutcheon for the rack bolt and fit the thumbturn. A good trick is to fit it when locked with the knob upright and then turn slightly to put the screws in. The operation was quite stiff at first until some silicone grease was applied to where the shaft passes through the mounting plate. This will also hopefully stop the excessive wear and failure reported in the previous review. Will assist a quick and easy exit out of the door especially in an emergency."