I have seen X0 transmission cranks with power meter on Facebook marketplace in the $225-300 range. You can get those and a 0 mm offset chain ring from wolftooth and you are set. 
The 0 offset chainring moves the chainline in the wrong direction. You need a -6mm offset. Wolftooth doesn’t sell an 8 bolt -6 chainring.
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Shhhh don’t reveal my z-list bicycle celebrity status to the world 
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I have literally no idea what this means but I shall investigate, thank you!
#notblessedwithmechanicalknowledge
I haven’t seen any secondhand 165 mm sets for sale here in the UK, yet, but I shall keep looking, thanks 
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I’ll default to you. I thought I remembered reading a 0mm chainring going from 55 to 52… but I must have got it mixed up. Thanks for the clarification.
After the weekend’s audax ride in which I was babying a shifting system for 300km because in the right shifter I intermittently couldn’t feel or hear clicks & shifting was sometimes slow, this afternoon I checked the cable & yep, it was frayed inside the shifter, with two threads separated from the rest of the cable, potentially interfering with the ratchet, so perhaps some damage was done. 
At least (for now) with the new cable it’s operating correctly.
Before installing the new cable I decided it was about time the bike had a more thorough clean than it usually gets, so together with the usual I sank the chain in a petrol bath & rebuilt the RD (yes I took them both off). When reinstalling the chain I couldn’t help but think of this thread. 
The chain is threaded correctly through the derailleur. Thanx for the reminder! But yes I have made that mistake too.
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Installed a new SRAM Transmission Cassette on my XDR freehub last night. Read the literature backwards and thought I didn’t need a spacer behind the cassette. To make matters worse, I torqued it with my 1/2" torque wrench thats about 2ft long, so I didn’t feel when I transitioned from tightening to stripping threads.
When the spacer arrives in a couple of days I’ll find out if I ruined like $300 worth of parts. Actually kind of crazy that the lock ring on these cassettes isn’t replaceable. Glad I bought the GX cassette and didn’t splurge on a $400-600 cassette.
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since 165 cranks are all the rage right now I’d just buy a XX1 DUB crankset with the quarq spider and sell off the old crank & chainring. Might be much more cost effective than buying faveros and converting them. Quarq carbon cranks + PM spider is about 700€ + shipping and whatever you guys pay in the UK as VAT. minus the money you get from selling the old crnaks vs 750€ for the Assioma Pro MX duo + import duties and postage.
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This is why I never understood threaded cassettes. 
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