I guess a part number for the attenuator in question would help.
Everyone does not have 86603A manuals to check the part number.
The o-ring failures are quite common.

The attenuators with o-rings are used in a number of instruments.
Without the attenuator part number, who would know that your attenuator is of a different design.

Glenn

On 11/21/2018 10:13 AM, Jeff Kruth via Groups.Io wrote:

I had asked if anyone was familiar with this type of atten. NOT the 8495 style, but a long stick. I guess no one reads. NO O rings.

Jeff

In a message dated 11/20/2018 7:02:42 PM Eastern Standard Time, glennmaillist@... writes:

Here is a video on repairing one of these attenuators:



The O-Rings are 2mm od x 1 mm id x 0.5mm thick.
Theses are used in watch making.

Hope this helps

Glenn


On 11/20/2018 6:31 PM, g lowrey wrote:
> Hey Jeff. Have you measured one to check the size? I have several
> sources that might be able to supply them -
> 73,
> Bo L.
>
> On 11/20/18, Jeff Kruth via Groups.Io <kmec=[email protected]> wrote:
>> Hi All!
>> Dont ask why, but I am resurrecting several HP 8660D generators with the
>> HP86603A plugin. The attenuators are "sticky", get stuck in a certain
>> position. If you have experience with this exact type of stick attenuator
>> (long silver block) with the 3 - 40 dB, 20 dB, & 10 dB sections and can
>> advise how to make a reliable repair, I would love to hear about it. Several
>> that I cleaned the solenoid shafts on seemed to be working only to stick
>> again. I do not know how to search the archives as well, can someone
>> advise?Thanks!73Jeff Kruth
>>
>>
>>
>>
>
>
>

--
-----------------------------------------------------------------------
Glenn Little? ? ? ? ? ? ? ? ARRL Technical Specialist? QCWA? LM 28417
Amateur Callsign:? WB4UIV? ? ? ? ? ? wb4uiv@...? ? AMSAT LM 2178
QTH:? Goose Creek, SC USA (EM92xx)? USSVI LM? NRA LM? SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"