Is the shim the dark grey washer between spring and brass part? Live and learn! I still don't think the shim will have any effect on the oil pressure but if it is meant to be there it should stay.
The spring in Alex's picture looks like a constant rate spring with evenly spaced coils and they need the same amount of force to compress 10% as they do 100%.
This is an interesting website re springs.
https://www.yostsuperior.com/variabl...ive-vs-linear/
The spring in Alex's picture looks like a constant rate spring with evenly spaced coils and they need the same amount of force to compress 10% as they do 100%.
This is an interesting website re springs.
https://www.yostsuperior.com/variabl...ive-vs-linear/
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