I certainly fall into the category of the "tinkerer" in this case. My nearest dealer is 90 miles away. I'm retired, so I have the time to tinker. Bottom line - I enjoy it.
With about 3 hours of effort I was able to identify 15 different standard (AS568A) o-rings by dimension and durometer. I am specifying Buna-N because it is compatible with the fluid, the operating temperature is low, and most of the seals are static. If something fails after a few tens/hundreds of hours I can get a different material like viton.
I have to buy minimum quantities of 25, 50, or 100 rings in each size. Cost breakdown: 1225 o-rings from McMaster-Carr for $53.65 gives an average cost of 4.3 CENTS per o-ring. Sure, I'm buying many, many times more rings than I need, but I'm still paying less than at the dealer for a few. Some of these will be useful when I get around to rebuilding the next system.
For those parts that I can't cross reference (3), I will call and pay the dealer. Either way, the post office or UPS will deliver what I need.
I may learn something here, but learning is what it's all about. There's some principle involved, too. The dealer or mfr. buys the same o-ring for 4.3 cents, puts it in a bag with a part number, and charges me from $1 to $10 for it. I have trouble with that...
AS568A is the Aerospace Standard (inch) published by the Society of Automotive Engineers (SAE).
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