[Healeys] Horn push for 3000 non-adjustable column

[Oudesluys]

Bob,

The regular Araldite is a 2-component (50/50) epoxy that is slow setting 
and can be applied in about a half to full hour time span at 20ºC. It 
will be fully set after more than 24hrs. You can soften it up only once 
by heating it up to 100ºC to adjust or undo, however most plastic will 
not be up to that. It is a clear substance but will yellow in time. 
There are plenty of other makes but I always have had best results with 
the genuine Araldite. We used it in the early '70's at BOC in the UK in 
the (militairy) avation R&D department. When in the UK I always buy it 
as it is often not available elsewhere.
I assumed that the broken up parts were Bakelite. Wrong apparently. If 
the horn button is clear plastic there is a chance it will work, but 
most thermoplastic materials are not very suitable for glueing compared 
to thermosetting materials. PVC, ABS, Perspex and some others can be 
glued reasonably well but PE and PP cannot be glued at all. Perspex can 
often be glued successfully using acetone when the pieces are a perfect fit.
I do not think brake cleaner will do any harm but try on a scrap piece 
first to make sure. Sometimes certain solvents cause some clear plastics 
to craze/crack.

Cheers,
Kees Oudesluijs


Op 23-7-2017 om 13:53 schreef Bob Haskell:
> Kees,
>
> I've heard of "Araldite", but not familiar with it. Not something I've 
> run across in the local hardware store.  Wikipedia says that it refers 
> to a line of epoxy, acrylic and polyurethane adhesives; first used for 
> a two-part epoxy in 1946.  Which are you referring too?
>
> The 100-6/3000 horn buttons aren't Bakelite, but clear plastic with 
> reverse side painting.  Brake cleaner would probably soften the 
> plastic. Does Araldite dry clear?
>
> Cheers,
>
> Bob Haskell
> AHCA 3000 MkI registrar
> http://www.ciahc.org/registry_3000mk1.php
>
> On 07/23/2017 03:22 AM, Oudesluys wrote:
>> Epoxy repair putty is not very good for the proper repair of parts 
>> that carry some load. Adhesion is not all that great. Bakelite can be 
>> perfectly repaired using Araldite, but first all traces of the putty 
>> have to be removed. Cracks can be filled when you open these up using 
>> a hacksaw blade, scalpel, Dremel etc. Just slightly bending the 
>> material to open up the crack a bit may cause the object to break 
>> completely. Cleanliness is absolute key so clean everything 
>> thoroughly using brake cleaner and let dry for a good while.
>> Use tape to create some kind of a mould to prevent the Araldite 
>> running of.
>> After 24hrs you can shape the Araldite using a Dremel, file, 
>> sandpaper and finish with fine wet 'n dry. After the repair the parts 
>> can be painted satin black.
>> Kees Oudesluijs
>>
>>
>> Op 23-7-2017 om 4:30 schreef Bruce Steele:
>>>
>>> Some time back there was talk of someone reproducing the horn 
>>> buttons for 100-6 and 3000 with non-adjustable columns and the 
>>> encircled 6 in the flash. Did anything come of this?  One of the 
>>> ears broke off mine years ago and after multiple repairs with epoxy 
>>> putty, I’m not sure I can fix it again.  Anybody have a source?  
>>> Mine has some internal cracking, which either gives it patina or 
>>> makes it look old, depending on whether you’re a glass half full or 
>>> empty kind of person.
>>>
>>> Bruce Steele
>>>
>>> Brea, CA
>>>
>>> 1960 BN7
>>>
>>>
>>>
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>>
>>
>>
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>