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Old 10-22-2008, 02:07 AM   #1
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Doorknob attachment to spindle


The lockset on our front door has separate knob and deadbolt. The knob is egg-shaped solid brass. It slips onto the spindle and is secured on the inside with a small (Allen wrench) set screw (the knob does not thread-on).

With use, the knob tends to loosen and slide off the spindle. No amount of tighening of the set screw has been effective. I have tried puting thread set liquids on the set screw, but the screw is not loosening it just has no "bite" on the spindle.

The spindle is flat and does not have the longitudinal triangular-shaped groove commonly found on locksets, so the set screw has minimum friction surface to provide resistence.

I have considered drilling a small pilot hole in the spindle to give the set screw more grip; but before doing that I thought I'd first solicit other ideas.

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Old 10-22-2008, 04:19 AM   #2
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Doorknob attachment to spindle


some JB Weld on that spindle first may help. then gently set the screw into the glue mass and let set. a pilot hole is a fine idea too, though it would weaken an already fussy joint. maybe a combination of both?

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Old 10-22-2008, 05:32 AM   #3
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Doorknob attachment to spindle


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Originally Posted by c2gene View Post
I have considered drilling a small pilot hole in the spindle to give the set screw more grip; but before doing that I thought I'd first solicit other ideas.
That was the first thought I had as I read the thread. The hole does not have to go all the way through, just enough to create a recess for the set screw to tighten to.
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Old 10-22-2008, 01:44 PM   #4
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Doorknob attachment to spindle


First, don't JB weld it. You'll never get it off when you need to. File a flat groove across the spindle where the set screw rests against. Then when you pull on the knob, you won't be depending on the friction of set screw to set the whole door into motion.
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Old 10-22-2008, 02:50 PM   #5
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Doorknob attachment to spindle


well sure ya can.... just take out the set screw on the OTHER side of the door..... *grin*
a groove is a good idea, but needs to be precise or it'll wobble. and if it's one of those flat 1/16th of an inch bars...... well.... you know.

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Old 10-25-2008, 10:39 PM   #6
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Doorknob attachment to spindle


Thanks to MdangermouseM, Maintneance6, and wrangler. I appreciate your input.

Just to give you some follow-up. I went the locksmith shop to try to buy a new spindle. They do make spindles with grooves on all four faces, incidently. The problem was that the only ones in stock were for thread-on knobs.

So, I ended up drilling a pilot hole in the spindle. It turns out that the spindle is not case-hardened steel and drilling wasn't a problem. I put some thread-lock "glue" on the set screw threads (it will break loose with normal tools, but resists loosening from vibration and normal use).

The repair seems to have worked well, but it took two years for the knob to become a problem, so only time will tell.

The DIY Chatroom is a great source of info and ideas. I'm glad to have discovered it. Hopefully, I can contribute to helping someone else.

Thanks again!
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Old 10-26-2008, 05:04 AM   #7
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Doorknob attachment to spindle


glad to help! we love a good challenge around here.... keeps our otherwise lazybrains awake! heh heh

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