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Im pretty sure logan that the power mates have a filter thread on the end so that is where i would be putting them.
Get a good quality one look at Bintel, Andrews, though also look to the states Opt corp, Hong Kong pete. They should be able to give you a look at price.
As for what is quality and what isn't John (asimov) should be able to point you guys in the right direction, though Astronomik, Baader are 2 decent quality brands i know of.
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