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A washer all by itself will blow out in seconds, it must have a capture groove.
The ORFS fittings have an O-ring capture groove on one part, if you can duplicate that with your steel piece, fine, but that's why the use of copper – to get the “crush” that takes the place of the O-ring.
Glad to hear the copper is holding up so far.
Account deleted.
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Never heard of after market hydraulics. Some were orchard models where you sit low and others like mine where you sit up high. Strictly for pulling. I do remember attaching a logging chain to a willow. Just happened to look back and see the tree was pulled up (root still attached) and starting to fall in my direction. Left the tractor running in a different direction. Also remember crossing a creek and the next thing I know was I laying on the hood. That is why I purchased the chinese dozer. Nice roll cage, seat belts, PTO and price.
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Not to beat a dead horse, but if the copper disc restrictor ever fails, I do not want to go backwards. Looking at the Parker O-Ring Handbook, Design Chart 4-2–Face Seal Glands, I see where the gland (capture grove) depth is 0.050 to 0.054 for a 1/16″ O-Ring. I then looked at my Harbor copper washer set and find a 1/4″ copper washer that is 0.04″ thick and 0.56″ OD. Would a steel disc with 1/4″ copper washer work? It looks like the 1/4″ hole is big enough that any shifting of the copper washer will not cover the hole in the steel disc (restrictor).
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A Cat 15 
, 4 cylinder gas engine. Barely remember those. Some had aftermarket rear mounted hydraulics I think 
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