Binding Lock Cylinders

Apply the proper lubrication in order to correct binding or sticking door lock cylinders or keys that are hard to insert.
The recommended materials for lubricating these components are:
- 5 W-30 synthetic motor oil
- Silicone spray

DO NOT use penetrating lubricants (such as WD4O(R)). These lubricants wash out the original lubrication and eventually evaporate, leaving little or no lubricating material. You may use these lubricants in order to unfreeze or loosen lock cylinder components.
1. Apply heat to the lock cylinder with a heat gun. Do not damage the painted surfaces.
2. Hold the lock cylinder shutter open with a paper clip or a similar object.
3. Force air into the cylinder using a compressed air and a blow gun attachment.
4. While you hold the lock cylinder shutter open, inject a small amount of lubricant into the cylinder. Refer to the above specifications.
5. Work the key into the lock cylinder several times.
6. Wipe away any excess lubricant from the key.