Hello,
Wow, 7 times replace...I respect you.
I inserted one smaller spring but it did not stop leak.
"Two spring" will tighten more around snout axis as you did.
Main reason of leak should be gap between seal and axis caused by needle bearing wear.
Fundamental solution may be replcement of needle bearing but two spring will be more easy way.
Thanks very much srt6prbk!!!
One more question, What oil do you use?