How do they fit together and work?

Knobbs doorknobs sets are supplied with 8mm standard square spindles - unless 7mm are requested (see below). One end of the spindle is fixed with epoxy glue into one knob whilst the other threaded end is screwed into a threaded metal insert glued into the other knob. A grub screw stops this knob from unscrewing off the spindle. Each knob fits into a wooden or brass rose (chrome and nickel plate also available) which is fixed to the door with screws. All necessary fixings are supplied.

There are basically two methods for holding doors closed:

a) Mortice locks or latches - these fit into a recess in the side of the door and so are hidden from view with the door closed. The doorknobs required to operate these locks/latches are called MORTICE sets and come supplied with two roses - one for each side of the door. Doors normally range in thickness from 30 to 50 mm. and Knobbs mortice sets are designed to accommodate these different thicknesses. We always assume that you require mortice sets unless advised that you have RIMLOCKS on your doors.

b) Rimlocks. These locks are planted on one side of the door and the combined thickness of door and lock is normally at least 60mm. To allow for the increased thickness Knobbs fit longer spindles on rimlock doorknob sets and only supply one rose, as the knob which fits against the rimlock does not need one. Although originally fitted to older doors there are still many rimlocks in existence and even new ones are being produced.

Most locks and latches have 8mm by 8mm followers - the square hole through which the spindle passes. However, some older locks have 7.6mm followers, in which case Knobbs can supply 7mm spindles (7.6mm keysteel is not available).