Thanks for the reply darren. Ill look into replacing the seals. I’ve had the 
camera open again. the bumpstop is definitely deteriorated - but to the point 
of no longer being sticky. 

I’m wondering what is the mechanism that returns the mirror to the down 
position??? because it randomly works every now and then. 


On 5 Apr 2014, at 17:16, Darren Addy <pixelsmi...@gmail.com> wrote:

> Hi Callum,
> The "bump stop" is the rubber that surrounds the focusing screen. When
> you take the lens off you will see it at the top. They like to
> deteriorate and go all gooey in time. If your mirror is sticking there
> you will probably see evidence of the goo around the edges of the
> mirror itself .
> 
> When this happens, the same thing is likely happening to the seals
> that engage the film door (bits sticking to the door edges that engage
> the slots in the body where the seals reside.
> 
> There is a guy in the U.S. that sells seal kits (very reasonably). He
> used to sell on eBay but gave that up due to too many run-ins with
> fraud, etc. But he still sells the kits. They come with all the
> instructions for doing the replacement yourself. His email is:
> jon_good...@yahoo.com
> 
> Hope that helps!
> 
> Darren
> 
> 
> 
> On Sat, Apr 5, 2014 at 12:44 AM, Callum Gregory
> <callum.greg...@iinet.net.au> wrote:
>> Hi,
>> 
>> I have a Pentax Spotmatic F
>> The mirror currently locks up. I've been told its the bump stop.
>> I'm wondering who people have fixed this and if anyone has photos of what 
>> the inside of the camera (bumpstop in particular) should look like?
>> 
>> Thanks,
>> 
>> Callum
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