DIY door knob gripe

I learned something new at the weekend, there's a good summary here:

Sprung v Unsprung Door Handles [for 'handles' read 'knobs']

Springs are required to get door handles to return to the horizontal after they have been pushed down. The spring can be located in the handles and or in the latch/lock. Most early handles were unsprung and most modern handles have springing.

You can tell if handles are sprung because they will return to the horizontal without being connected to the latch/lock. If you select unsprung handles then ...