[CAUT] Teflon Bushings

[Horace Greeley]

Hi, Roger,

At 08:53 PM 11/26/2010, you wrote:

>Hi Jon,
>               Having done quite a few Teflon bushings with CA. I 
> think the result is superior to felt. Way more durable, and consistent.

Agreed.

>I was a great idea that had under developed engineering. The problem 
>could have been solved for commercial production quite easily, but 
>there was no will to do so.
>That is a personal quote from Joe Pramberger.

The other problem, of course, is that in addition to lacking the 
resolve to really make the product commercially viable, it also 
failed in two other critical areas.  The first was that, when 
problems arose with the system, the problems were denied.  ("A 
Rolls-Royce has never had a broken axle.")  Perhaps more importantly, 
the solid-bushed Teflon action was a number of years into production 
before any procedures for servicing it was available, let alone tools 
with which to perform the service.  It wasn't until things were 
largely at crisis level that Freddie Drasche started teaching his 
home-grown technique of rolling brass center pins between two files....

Too bad...still an excellent concept...once fully worked through, 
it's very stable and will last a long time.

Best.

Horace



>Regards Roger
>
>
>At 10:01 AM 11/26/2010, you wrote:
>>Roger & Ed, thanks for the encouragement. Here's a photo of the relocated
>>knuckle and reinforced yoke.
>>
>>This is a 1971 L donated to the Cape Cod Conservatory. Heavy action, high
>>friction readings but no binding components. Moving the knuckle should drop
>>the friction to a reasonable level. The original knuckles were 11mm wide.
>>
>>This produced excessive after touch and a drop screw head buried 
>>into the flange.
>>I'm confident the knuckle relocation and size reduction will bring the action
>>around to a manageable regulation.
>>
>>One argument to be made for not replacing the shanks is that these 
>>are seasoned,
>>new ones would travel and twist in the coming years. I think Teflon 
>>bushing are
>>Ok, it's the unstable wood around them that causes the problems.
>>
>>Now on to graduating their weight and repinning. I'll also be 
>>installing underlever
>>assist springs and replacing the single string felts.  Fun & Games.
>>--
>>
>>Regards,
>>
>>Jon Page
>>
>>
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