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Fitting a Hinged Security Screen Door Lock

In the previous blogs we discussed how to firstly hinge a door to a timber jamb and then how to fit the lock furniture provided in the accessory pack. Furthermore we discussed how to test the lock to make sure you have a good understanding of how to use the lock and, most importantly, gain a good feel of the locking action from a physical feel, the sound of how the lock works and of the visual action of the lock.

Now we have established the above let’s now proceed with the actual lock cut outs to the door jamb. There are two choices in locks when you buy a Seconline Security/Barrier Screen Door.

  1. A single lock

  2. A three-point lock or a triple lock

The procedure after the lock is installed from an ongoing point of view is no different for both locks as they will deadlock with the key and also deadlock the internal snip with the key. Both locks will lock with the internal snib and in the case of the three-point lock all three tongues will engage simultaneously.

Now to the lock cut outs. Hold the door now in the open position; engage the small trigger located above the main tongue to engage the tongue into the locking position. Now without touching the door handles roll the internal snip across to the 10 past or 10 to position whichever is the case based on a left or right hand door lock, to engage the lock into the full lock position which in the case of a three-point lock door will engage all three tongues.

Now with a sharp pencil or any type of marking pen that has a fine point and can be removed, push the door up to the door jamb and mark above and below all three tongues.  In the case of a single lock mark above and below the centre tongue. It is important at this point that we recognise that the action of the small trigger above the main tongue is not to be inside the striker hole cut-outs. Its purpose and sole purpose is to trigger the main tongue into the locking position inside the door cut-outs on the door jamb. It must never be allowed to go inside the striker hole cut-out.

Now with a straight edge of some description (a school ruler is ideal for this purpose), make horizontal marks directly into the door jamb from each of these marks that you have made above below the locking tongues. Now with the striker plates that will be located in your accessory pack, hold these centre to the horizontal marks you have made on the door jamb and use a pencil or pen to completely mark out the actual cut-out using the plate as a guide.

Once you have completed this use a sharp 3 mm drill to ribbon drill completely around the marks so as to weaken the timber. Once this is completed use a 10 mm sharp wood chisel to remove the pieces of timber and clean the holes carefully making sure to remove any possible points of restriction for the door tongues. It is important that this job is done very carefully particularly on the centre locking tongue.  If they are restricted and do not go all the way into the holes provided then the lock mechanism will not deadlock.

Once you have cleaned all holes thoroughly, stand outside and close the door and test the lock using the key.  You may have to use the edge of your chisel to depress the trigger to engage the central tongue. Make sure that you have the same locking feel and action as you had when the door was in the open position. Repeat this process several times, both in the unlocked open position and then in the locked position. Retest this procedure from the inside by using the internal snib. You must have the same action in the fully close position as you have when you simulate this action in the open position.

Once you are completely confident the lock is working correctly, use the screws provided in the accessory pack pre-drill the holes and fit the locking plates.

Retest the door to make sure that everything is functioning. You have now successfully fitted locks to your Seconline Security Screen Door.

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