On 15/01/2014 14:39, Johny B Good wrote:
On Wed, 15 Jan 2014 13:20:17 -0000, "David B"
wrote:

"Eiron" wrote in message
...
Why are they so crappy?
http://www.polkaudio.com/forums/atta...8&d=1171259648

Anyone know how long replacements last?
Is there an improved design that actually works?
Or does everyone fix theirs with metal pins and epoxy?


I've not got a Linn, I have a PT1 but I've taken the hinges off and simply
lift the lid off when in use.
Who wants a rattly old lid on their turntable when playing records?

Looking at the picture, it's quite clear the hinges weren't designed
by an engineer (more like it was something designed by "The Pointy
Haired Boss").

That arrangement for counterbalancing the weight of the lid, assuming
the hinges had been properly designed using metal instead of plastic,
places a very high stress on the back of the lid itself which then
needs to be made much stronger than the rest of the lid.

Assuming the lid is strong enough to carry on using the existing
hinge location for applying the counterbalancing force and assuming
that it's possible to sufficiently dismantle a set of brand new
hinges, one way of reducing the risk of another premature failure
might be to slip a piece of brass sheet (obtainable from model making
stores) in between the spring and the plastic hinge so that the end of
the spring slides over the brass instead of digging into the plastic.

My first attempt at a repair included a shim but it just broke the
plastic elsewhere.
Something like a brass shim to spread the load would be a good idea for
new hinges.

--
Eiron.