McDermott QR

P

Piratejethro

AzB Silver Member
Silver Member
Anybody have an idea of what this thread actually is? I have a McDermott Cue of the Year with the McD quick release, and was thinking of making my own shaft for it, but I am searching the internet and having a hard time finding out exactly what thread pattern, and I am guessing I will probably have to contact McDermott themselves to get the brass insert for the shaft, unless somebody in here has any info/supplies available for sale? Thanks

Jim Notestine
 
Piratejethro said:
Anybody have an idea of what this thread actually is? I have a McDermott Cue of the Year with the McD quick release, and was thinking of making my own shaft for it, but I am searching the internet and having a hard time finding out exactly what thread pattern, and I am guessing I will probably have to contact McDermott themselves to get the brass insert for the shaft, unless somebody in here has any info/supplies available for sale? Thanks

Jim Notestine
Click to expand...


McD, may have narrowed it down to one but there was a time not to long ago, they offered three, a short run on Uni loc-s which they will still do upon request, the others are a 3/8X16 and the 3/8X10.
 
I doubt you'll get squat from McD, particularly items of a proprietary nature.
If you do talk them into selling you one, they're like $12 IIRC.
Not being one to let a minor obstacle hinder me, I found an almost equivalent replacement.
One minor machine operation and they work perfectly.
Stop by my shop again and I'll give you one.

KJ
 
KJ Cues said:
I doubt you'll get squat from McD, particularly items of a proprietary nature.
If you do talk them into selling you one, they're like $12 IIRC.
Not being one to let a minor obstacle hinder me, I found an almost equivalent replacement.
One minor machine operation and they work perfectly.
Stop by my shop again and I'll give you one.

KJ
Click to expand...

Do you alter the uniloc? Thats what I did to fit a predator shaft for my mcdermott. A guy owed me $ and he had the 314 and I figured it was kinda free because I didnt expect to ever see the money. Any way it worked, and I got to find out that I dont care for ld shafts
 
No, I don't alter a Uni-Loc. They are not to be toyed with.
Interesting story though.
Would you care to elaborate on what you did to make a Uni-Loc insert fit a 3/8x16 pin?
I can only guess.

KJ
 
KJ Cues said:
No, I don't alter a Uni-Loc. They are not to be toyed with.
Interesting story though.
Would you care to elaborate on what you did to make a Uni-Loc insert fit a 3/8x16 pin?
I can only guess.

KJ
Click to expand...


Or maybe his McDermott is the 3/8X10????
 
Michael Webb said:
Or maybe his McDermott is the 3/8X10????
Click to expand...


:confused: :eek:;) :cool: :rolleyes: :thumbup: I've had these about 15 years from the Original owner of McDermott. They don't sell parts today because they depend on repairs just like we do to maintain their business. I can respect that. Have a nice day.
IMG_1730copycopy_zpsd6b36e87-1.jpg
 
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KJ Cues said:
No, I don't alter a Uni-Loc. They are not to be toyed with.
Interesting story though.
Would you care to elaborate on what you did to make a Uni-Loc insert fit a 3/8x16 pin?
I can only guess.

KJ
Click to expand...

Once you face the uniloc pilot off, there is basically no 3/8-10 left or very little. Put a little chamfer on it and its ready for new threads. Both the uniloc and mcd have a 5/16 pin so that's already done. You might lose a thread or two of engagement with the chamfer but going to more threads per inch your not really hurting. If I had started with a partial shaft I then would have made a new insert altogether. This was a shaft that was basically free and worth the try.
,Tom
 
And that actually was my guess.
Just for the sake of accuracy though I should speak to your numbers.
While the diameter of the blank-pin section for the Uni QR & the McD QR
is the same, they are .278", not .3125" (5/16").
Don't want to confuse the readers.
Also, the Uni TPI isn't 10, it's closer to 12. Now it gets tricky.
I don't know if Paul based the TPI on SAE or Metric count.
A metric 2mm & the SAE 12 are kinda close.
A 3/8x2mm would be a bastard though, even by metric standards.
What makes it more difficult is that the thread is a modified ACME.
Probably not going to find a tap for that one.

Thanx for getting back to us on this.
I actually was curious as to what your procedure was.

KJ
 
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Pin diameter

Your probably right on the diameter, it was about 4 years ago that I did it. Might be my wife's cue that was 5/16 I had to mod an ob1 for her. That was just a boring bar for the peachaur quick release pin. Got a great deal on the shaft but it needed the slip fit for the quick release cut.
,Tom
 
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