Recommendation for someone to tune Scubapro D300/D400

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Do you have a specific question about the D300? I have a D400 schematic and repair guide. I don't know if they'll be helpful to you, but you can PM me if you'd like with your email address and I'll send them to you.

Step one is finding a rebuild kit and I believe I suggested vintage doublehose for that in your other thread. Did you get one?
 
I'm a fanatic of all Scubapro D series, all my regulators are from the first pilot to last D400, love how natural and smooth they breath, as mention Da Aquamaster is very helpful, I reed all of his post about it, I have 6 or more 2nd stage D400 so end up serving them, my recomendation is to learn how to do it, because they are so sensitive that you have to re adjust after some dives, to keep them at hi peak performance lowest cracking effort and inhalation that I never found and other regulator
 
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I have a D400 as well and would be interested in the literature. Mine is still under parts for warranty. Will PM.
 
https://www.shearwater.com/products/peregrine/

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