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David P:4 regs X 3 stages = 12 stages $360/12=$30 a stage including parts. Thats not a bad price (we charge $25 w/o parts). IF your LDS would let you attend a scubapro reg workshop, your are a certified SP repair tech as long as you work for an authorized SP dealer and the work is done though them. Then you have to be able to buy the parts, oh yeah and youll want a magnahelic gauge, IP guauge, inline adjusting tool,.... about $2-3k worth of tools from scubatools if you want to repair and tune your reg right... oh don't forget a good ultrasonic cleaner, thats only ~$400...
If you don't dive much it may be cheaper to buy 2) Mk2/r190 every other year.
I believe he is talking about 4 2nd stages and 2 1st stages for 6 stages at $60 per stage including parts.
Those tools may be necessary for the shop tech but they are excessive for the DIYer. The kitchen sink, a bit more time, and a test dive are adequate substitutes for the magnahelic gauge and the inline tool. And the DIYer's ultrasonic cleaner is another luxury but can be had for under $50. It is unfortunate that almost every time a thread like this pops up, it draws out some "professional" who feels obligated to discourage the potential DIYer by telling him he has to make extravagant investments in tools that many smaller LDSs don't even make.
If the OP is talking about the Mk2/R190/Air2 (and I assume he is based on the parts cost of only $40) then store the 2nds with the purge depressed slightly to prevent the seats from taking too much set, and you could easily go 4 year or more before servicing. But it would be best if you were able to make minor adjustments to maintain satisfactory levels of performance.