>> On my camera (Canon 300D) the remote shutter release is just a stereo 
>> 2.5mm jack, easy to pick up from electronics stores and wire up 2 simple 
>> switches if you can solder.
>
> Hmmm, <looks at camera>.  Pentax *iST DS here.  I can see it is a coaxial 
> socket, but my impression is the bore is too small for a 2.5mm jack. 
> Squinting into it with a magnifying glass, I think I can make out sleeve, 
> ring and tip contacts.  I think I have some in my old electronics junk 
> box, so it won't be too hard to check.

A quick google seems to suggest it actually uses the same 2.5mm plug as 
mine...

http://www.digicaminfo.btinternet.co.uk/hmcablerelease.htm

Seems like you can pick ones up on ebay for £5-£10 anyway.

>> I suppose another alternative would be to use some sort of clamp to hold 
>> down the shutter button, then you can use the black card trick while 
>> attaching it and removing it.
>
> Uh-oh, carpentry and metalwork were my two worst subjects!  :-D

Or just get a small clamp from a DIY shop.  Like this one:

http://www.roger-russell.com/cameras/clamp.jpg

Depending on how much the shutter button is recessed you might need to 
blu-tak something on to it so that the clamp works - but shouldn't be too 
hard.

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