I don't have a valve spring compressor, nor am I in Adelaide atm, but when I pulled mine apart instead of finding the correct tool I used a piece of PVC pipe, about 1" in diameter, & cut a little square (about 1/3 of the circumference) out of the side on one end. I used this to push down on the retainer & stuck a little magnet in the cut out section to pull out the collets.
Wasn't too hard to do, you do have to put a bit of weight on it but it saved buying or finding & borrowing a proper compressor.
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