Please note: the thickness of doors can vary, therefore make sure that you do not go into and damage the latch when you are tightening the screws. For face fixing inner roseplates, make sure you have pre-drilled pilot holes and fit with the screws provided.If you have a door knob with bolt through fixings, make sure the correct pilot holes have been drilled that line up with the bolt through fixings on your architectural tubular latch.Place the inner roseplate over each end of the mortice bar so that it sits flush against the face of your door.For guidance on fitting tubular latches please see our previous video and guide HERE. Insert the 8mm mortice bar spindle into your pre-drilled bore hole in your door, and through your tubular latch.Step-by-step guide to fitting a door knob with concealed fittings This inner roseplate needs to be unscrewed from the door knob prior to installation. There is also a plastic washer to ensure the fitting is not loose. In order to fit this type of door knob to the surface of the door, there is an inner/hidden roseplate with fixing holes. This helps to give a snug fit for the grub screw fixing as it is tightened down onto the mortice bar. The mortice bar in our example has a helpful feature of a split at both ends, with a grooved indent. Each door knob is fixed to the mortice bar, on either side of the door. The mortice bar is 8mm wide metal bar that fits through your door. There is a hole located on the neck of the door knob and this houses the grub screw. You can remove the door knobs from the mortice bar by using the Allen key to unscrew the grub screw.
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