The brass knob on the front door of your century home turns, but nothing happens on the other side. The latch stays tucked in, the door swings free, and the only thing holding it shut is the deadbolt and a bit key that has worn down to a nub.
Occasionally a case really is finished, with a cracked body, a bolt worn to a sliver or a hub broken in two, and the answer is a replacement that respects the door. Reproduction mortise cases are made in common vintage sizes and backsets, and a modern case with a pin-tumbler cylinder can fit many old pockets with little woodwork once its faceplate and hub also line up. The locksmith measures the case, backset, faceplate and trim spacing before ordering, aiming for the new case to drop in with your original knobs and escutcheons going back on. From the hallway, the door looks untouched; it just works.
Sound familiar?Toronto
Vintage Mortise Lock Service · Toronto
Scene 1
Before blaming a lock that may be perfectly sound, the locksmith looks at the door. With it open, the lock is cycled; with it closed, the latch and deadbolt are tried again. A lock that works open and fights when shut is telling you the door has moved. The gap around the door is checked top to bottom, the hinges are watched for a sag when the door is lifted, and the strike plate is inspected for bright wear marks where the bolt has been scraping past. In an older home with a solid wood door this is a routine finding, and correcting it is often most of the repair.
Scene 2
Springs are the usual culprits and the easiest fix. Broken coil and flat springs are matched from stock by length, wire gauge and shape, and fitted so the latch snaps out and the knob returns to level. A worn or cracked lever is matched from a donor case where one exists; where it does not, a replacement is filed from stock to the original's profile, which is slow, careful bench work rather than magic. A rounded hub is replaced or bushed. When every part moves as it should, the case is closed and cycled by hand with the cover on until the action is smooth and even in both directions.
Scene 3
What you get back is the door you had, with the lock working as it was designed to. The knob returns level with a snap, the latch catches when the door is pushed shut, the deadbolt throws with a light turn of the key or the thumb-turn, and the key goes in and out without a wiggle. Nothing on the face of the door has changed except that the brass has been cleaned where it was handled. The locksmith runs through each function with you from both sides before leaving, so the standard of what has been done is something you have seen, not something you have been told.
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On a cylinder mortise lock this points to the cylinder rather than the case. The set screw that holds the cylinder in the door has loosened or stripped so the whole cylinder rotates, or the cam on the back of the cylinder has worn or is the wrong shape and no longer catches the bolt lever. Both are fixed by resetting or replacing the cylinder and its set screw, and the case itself is usually fine.
Usually yes to the first, and to the second once the locksmith checks the locks. Interior mortise latches with privacy turn buttons are lighter versions of the entry lock and respond to the same clean and re-spring. Interior locks in a house were sometimes supplied to one bit key, and where the key sections, warding and levers actually match, the locksmith can restore that arrangement so a single key opens several bedroom and bathroom doors. It is a practical thing to have when a child locks a bathroom from inside.
Rarely, and it is not the better route. Almost everything that fails is inside the case, and the case only opens once it is out of the pocket, which takes a few minutes and leaves no mark. Working through the keyhole with an unapproved or over-applied spray tends to wash out what little lubricant should stay and gums the levers later. Removing the case, cleaning it properly and refitting it is the repair that lasts.
TorontoOntario
Vintage Mortise Lock Service · Agincourt, Agincourt North, Clarks Corners, Sullivan, Tam O'Shanter
Every square is one home in a hundred.
On-site assessment
The brass knob on the front door of your century home turns, but nothing happens on the other side.
(289) 806-4250, open 24/7.
On-site assessment preferred · (289) 806-4250, open 24/7
