Certainly works a treat if the filter screws on vertically, quite agree GB. I always do it on my Notrun wiv a filter where it's that way up. Much reduces that irrational fear caused by the delay in seeing a return, as you watch the oil level sink at the tank! (Then I have the other, less irrational, fear that the big gasket won't have seated and all the returning oil will end up on the floor anyway . . . . while I keep saying to myself 'yes, you paranoid, it's only MEANT to be done up hand-tight'.
But my modern-ish Yamaha is a sideways-on job . . . yuk - but so what? heck of a pump in there probably . . ; and the original better-than-nothing pressure-side filters on my much-favoured amc twins are across the cases below the dynamo & forrard of the cylinders - so 'yuk' again. For start-up after cleaning or replacing those I have developed a special glue-on nonchalant expression . . . which gives way to relief when the oil turns up again in its own good time.
