U9.145AWthumbturn side knob idle repair replacement

"The knob inside the door spins idle"

It was a request from a major clothing chain store, a tenant of a certain large home center.It seems to be a defect of the backyard door.Since entering and exiting the tenants of this kind of tenant is controlled, the instructions are not clear, but look for the security room at the back door.

The parking position and the entrance door seem to be far away. I walked about 100 meters and finally arrived at the site.Guided to the backyard, check the target door.

Certainly there is an abnormality in the operation of the knob on the thumbturn side.It often idles.Looking at it, the round seat is loose.

I re-tightened the round seat and checked the operation again, but it still slipped.When I remove it, the spindle plate is short. It's about 13 mm.This looks like a knob for HMS.

However, the lock case is 145A for DT25-28mm. The spindle plate for HMS does not reach.Furthermore, when the door thickness is measured, it is about 37 mm in total.After subtracting the step, it is about 33 to 34 mm.A standard knob would be appropriate.

I think it worked well until now with deception, but the cause is clear.It was improved by replacing it with a standard HMD type knob.This time the knob is definitely working.