Pushed in dust caps
 

Once upon a time on usenet Jim Price wrote:
On 17/11/16 11:09, Eiron wrote:
On 17/11/2016 10:49, Iain Churches wrote:
"Phil Allison" wrote in message
...
RJH wrote:
While on the theme of questionable upgrades, I've just bought a
pair of S/H ATC SCM 19 speakers - an older pair, the same as
these:
http://www.tmraudio.com/product/atc-...-factory-boxes


They arrived with the dust caps pushed in - both:

https://flic.kr/p/PhbLmi
https://flic.kr/p/PhbPLz

The seller sent them in decent boxes, but packed them solid with
bubble wrap. I think the bubble wrap just worked its way in
during transit. They work fine - but obviously I'm not happy with them
like this.
And no
grilles.

I've contacted the buyer, and I'll see what he says - but I was
wondering what the thinking was on making this good.

--


** A sewing needle usually does the job.

Just dig the point into the depressed centre of the dome, lean the
needle
over and pull back. May need a couple of tries to get it all out.


Phil's remedy is a good one.

An alternative, is a small soft-plastic suction cup
(for example the kind used to attach a parking
permit to a car windscreen)

Gentle suction, and improvise something from whatever you find in the
house.
For instance I would use a VAX vacuum cleaner on its lowest setting,
with the bypass hole open, and a clarinet, though a kitchen funel
would do instead.
Regulate the vacuum with the hand holding the VAX to the funnel.
Or you could just suck. It needs very little force.

What you need is a self-limiting force - an initial jolt to get the
thing moving, but you don't want it to move further than the position
it's supposed to be in.

If you're careful that's not an issue as the semi-sphere shape is very
strong - far stronger that the energy needed to suck a dent out (as long as
you're not trying to pull away while sucktion is applied).

I'm thinking of something like a cross
between a breast milk pump the shape of the dome and a solder sucker.
Once the dome material reaches the dome shaped breast pump bit, any
further movement has to be somewhere else. Someone on here with
loudspeaker design experience ought to be able to design the
parameters of the solder-sucker bit, but as long as it's a good fit
for the dome and the evacuation hole[s] are small enough that the
suction doesn't break the dome material, a play-it-by-ear solution
ought to work.

I have used a variable speed vacuum cleaner with a by-pass hole and a cut up
50p plastic funnel attachment to fit in the past with good results (as Eiron
described). I used my thumb over the bypass hole and made sure I wasn't
pulling against the cone's travel or dome's glue.

With the porous fabric ones a neede is the best bet - a felting needle works
too if you have access to one.
--
Shaun.

"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)