Struggling with crushed screws PR.PGF703 Push-pull grip handle Cylinder disassembly, cleaning and repair

"Cylinder malfunction inspection and repair"

PR.PGF703 This is a thicker model with a grip handle more than 50mm from the door.You won't see a security thumbturn on this model.

I thought that depending on the situation, it would be a spray method that didn't require disassembly for inspection and repair of cylinder operation defects, but that's not true.The work took 60 minutes.

When I opened the front, it was in a state of considerable deterioration.I didn't think it was an 18-year-old property.Perhaps the condensation is terrible.

I tried to remove the cylinder by removing the grip handle, but the screw was bent and only half installed. One M5 screw on the pull-leg is crushed.Furthermore, the front screw is not attached.

Since there are workers with various skills, the past work may have ended quite inappropriately.

Anyway, I had a hard time with the crushed M5 screw.Eventually, after drilling the screw, the countersunk screw head was removed and tapping was improved, but it was not enough because it did not go to full tapping.

When I finally thought that the grip handle had come off, the inside of the cylinder was completely white.Cleaning this improved the operation.In addition, cleaning and lubrication inside the lock case.Finally the whole thing has improved.