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Thanks, John.
With the distrust of my current collimating tool I've taken to standing back from the focuser and attempting to align the secondary holder by eye within its boundaries. Then I've lined up the centre of the primary mirror with the reflection of my eye's pupil.
Should I then (thinking that I'm close) use the laser to check then I find that the laser reflection doesn't even hit the secondary! I'm a failure, I tell you, a failure.
Hence the need for assistance with a Cheshire. I do not wish to fork out a (to me) significant number of dollars only to find that whatever I purchase is as deficient in capability as is my current unit. The latter has been relegated to use as a pointer when viewing images on a television or computer screen, which purpose it serves quite well (though a bit heavy on batteries).
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