I thought it was about time that ATR shocks had their own thread! For those that don't know, ATR shocks are a premium product that cost around twice as much as Spax adjustables, but half as much as Ohlins. To give some idea, my front pair cost me £720 in Feb 2021. The standard colour is a kind of copper-orange but I chose to have the optional black finish for a small premium.
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Simple 'Hard' & 'Soft' adjustment
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Nicely machined spacers can be made to fit your chassis exactly.
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It's also worth investing in a couple of decent C Spanners that actually fit the adjusters - like these: Motamec MT-CSP1-ST, £21 for the pair from Motorsport-Tools.com
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At one stage, ATR supplied o-rings to fit between the bearings and spacers to keep the weather out but I don't think they do any more. However This O-Ring from Amazon seems to work well: 26mm OD x 19mm ID x 3.5mm thick. They come in a pack of 50 and you only need 4 per shock so you will have plenty of spares!

A well known jazz musician has sourced these Uprated Bearings that may be worth investigating when the standard ones wear out.

Talking of that, ATRs are fully serviceable and can be rebuilt at the ATR factory as necessary.

Your contact for ordering ATRs is Dave Ainsworth at Dampertech (07973 382199, dave@dampertech.co.uk). Talk to him about custom spacers and finishes etc.

Disclaimer: I have no connection with ATR or Dampertech apart from being a satisfied customer.

Andy