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Dindsy,
Is there a film processing shop anywhere near to you? There are lots of people who still use film for photography and I'd lay you odds you'd collect a bag full of old canisters if you ask nicely.
On the collimation tool subject: I too purchased a laser collimator but found it too sloppy to be of practical use. I'm sure that not all laser collimators are the same - it was probably just the unfortunate coincidence of tolerances. I then purchased what is known as a 'Cheshire' collimator (I don't trust my DIY skills) and have found it to be good - although, to be honest, I've not had much chance to put it to a real test. You know, cloud, smoke, no time when the sky is clear . . .
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