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Loose chassis nut (hank bush) fix

Posted: Mon Sep 21, 2009 9:44 pm
by Dr.HI-TONE
If you see a lot of Hylights or just get unlucky with your first, you may come across one with a loose chassis (hank bush) nut.

I just got one that was completely pulled out of the chassis!

Here is one way to fix it.

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Use a hardened piece of steel and two small C clamps to support the loose hank bush.


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Using a ball pien hammer, gently work the edges of the hank bush into the surrounding steel of the chassis.


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once finished the hank bush should be firmly secured.

Good Luck and Happy HIWATTing!

Re: Loose chassis nut (hank bush) fix

Posted: Mon Sep 21, 2009 10:12 pm
by OldSchoolDave
Cool info!

I learned two things today:

1) What a "hank bush" is

-and-

2) Dr.Hiwatt uses Tool Shop tools (a new endorsement deal? :mrgreen: )

Dave

Re: Loose chassis nut (hank bush) fix

Posted: Mon Sep 21, 2009 10:17 pm
by Dr.HI-TONE
:lol:
I came home from work on a mission.
I had already finished fixing it, when I realized that I should have taken pics in case it might help others.
Darcy made fun of the tool shop tags too!

Re: Loose chassis nut (hank bush) fix

Posted: Tue Sep 22, 2009 1:02 pm
by marwatt
where to buy those nuts??

Re: Loose chassis nut (hank bush) fix

Posted: Tue Sep 22, 2009 4:54 pm
by mhuss
In the U.S. they are called press-fit nuts or sometimes PEM nuts (after the original mfr.) Any place that sells lots of machine-screw type hardware should have them (e.g., McMaster-Carr)

--mark

Re: Loose chassis nut (hank bush) fix

Posted: Tue Sep 22, 2009 5:19 pm
by Dr.HI-TONE
I think the only tricky thing would be finding them in the #2 Imperial British thread to match the others. ????

I haven't looked for them.........

Re: Loose chassis nut (hank bush) fix

Posted: Tue Sep 22, 2009 5:37 pm
by buster

Re: Loose chassis nut (hank bush) fix

Posted: Tue Sep 22, 2009 5:44 pm
by Dr.HI-TONE
Thanks Buster!

Re: Loose chassis nut (hank bush) fix

Posted: Wed Sep 23, 2009 12:19 pm
by mhuss
Hmm, that page only lists Metric sizes, but does mention BA in the 'thread forms' box.

Dr., isn't the US 8-32 thread very close in size to 2BA?

Anyone, is there an equivalent M# thread that is very close?

---mark

Re: Loose chassis nut (hank bush) fix

Posted: Wed Sep 23, 2009 12:27 pm
by Dr.HI-TONE
10-32 is the closest.
I don't know about the metric threads????

Re: Loose chassis nut (hank bush) fix

Posted: Wed Sep 23, 2009 4:44 pm
by xsubs
The metric size closest is M5 x .08, but that's not a perfect fit either. Neither that nor the 10-32 bolt would thread all the way in on my chassis. They'd go in a few turns, then jam.
One of my older 103's was missing two original bolts, so I tapped all four out to 10-32. The tap barely touched the threads at all, and went through easily. It's that close, but there is a difference. I couldn't find the British thread bolts anywhere here on the East Coast of the US. I'm sure I could have in Ireland (I'm there often), but didn't have the patience! I'm not worried about "collector value" as my Hiwatts will be buried with me! :twisted:

Re: Loose chassis nut (hank bush) fix

Posted: Wed Sep 23, 2009 5:15 pm
by buster
xsubs wrote:The metric size closest is M5 x .08, but that's not a perfect fit either. Neither that nor the 10-32 bolt would thread all the way in on my chassis. They'd go in a few turns, then jam.
One of my older 103's was missing two original bolts, so I tapped all four out to 10-32. The tap barely touched the threads at all, and went through easily. It's that close, but there is a difference. I couldn't find the British thread bolts anywhere here on the East Coast of the US. I'm sure I could have in Ireland (I'm there often), but didn't have the patience! I'm not worried about "collector value" as my Hiwatts will be buried with me! :twisted:

Hi.
In order,smallest first. 2BA Threads per inch = 31.25 Tapping drill size is 4MM or 0.1575"
Then comes 10/32 TPI = 32 tapping drill size is #21 or 0.1590"
Then it's M5 tapping drill size is 4.20MM or 0.1654".

The reason the screw jammed was the slightly different TPI.
So indeed,not a lot in it.