[Boatanchors] National HRO-7 Chassis/Cabinet Disassembly Problem

[Bill Stewart]

Tnx Bob,
I suspect you are correct. Also, this dial may not have been removed
since it was built. I prefer flats on shafts for the set screws. The
screws will surely 'boogger' up the shafts. I may try three wedges
evenly spaced to try and ease it off. Will also try some of the Kroil
if I can find some. Thanks to all for the suggestions.
73 de Bill K4JYS

----- Original Message -----
From: "Robert Bethman" <oldrotorheadsarge at outlook.com>
To: boatanchors at mailman.qth.net
Sent: Tuesday, November 28, 2017 11:35:47 PM
Subject: Re: [Boatanchors] National HRO-7 Chassis/Cabinet Disassembly Problem

A stuck PW Dial after loosening and/or removing the set screws is 
"usually" the result of having been over tightened.  This deforms the 
shaft enough to cause it to not come off!  With care and some pressure, 
it can be pried off without too much force.

The shaft then needs to be filed down to round again.

Had this on an HRO-50.  It had chewed the dial up enough that I had to 
ream it out with a machinist's ream to 3/8" and put a brass insert with 
holes cut out for the set screws.

Regards, N0DGN

On 11/28/2017 5:43 PM, Bill Stewart wrote:
> GE All,
> An HRO-7 recently came into the 'black hole' here. It works, however the Phasing
> control is either shorting or opening up during its rotation and cuts out the signal.
> There is a pretty wide area of rotation that does this. I need to get into the phasing
> box. It has side plates and need to take off the outside one to get access to the phasing
> variable capacitor. Looks like all the knobs and dial must be removed to get the chassis
> out of the cabinet. The PW dial, with set screws loose, is not coming off. Any ideas on
> getting it loose....is it ok to carefully pry some on it. I don't want to mess up the dial or
> gear box. I may be able to put some liquid wrench down the empty set screw holes
> .....any other ideas?
>
> Thought I'd ask before I fouled up something....thanks.
> 73 de Bill K4JYS

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