The begining was s/c oil leakage.
I replaced oil seal with additional spring ring but it leaks.
Then replaced needle bearing at snout but faced other problem.(It has many stories)
Anyway I agree with you.
I have always used hollow bolt and leakage occured 2-years later after replacing s/c oil with jet oil.
Snout breathing was found by accident.
Only one is easily breathing and it may be original condition, Others were no breathing but now very hard breathing after air pressure and chemicals.