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Hi John,
I built and bought, so can help either way.
Buying? I used Scopestuff in the US, and bought a couple of their smaller 3" heaters.
Rob Beck, better known as "Robby" made my controller, but the Kendrick or similar are good as well. (I was just frugal).
I also made a heated strip for a 7" Mak/Newt, from nichrome wire, the correct thickness/length.
Whichever way you go, the use of a heater is almost necessary sometimes, and once used is a revelation.
Gary
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