My swinging arm does have the casting marks for a drain and filler plug which I have considered machining out and putting plugs into, but have ruled out as I suspect that the oil will weep from the bottom gaiter.
I do get longer life by using a shorter shock from an R100R, the last one did 103,000 miles, that is about 165,000 km in new money, it also means my feet are flatter on the floor which helps.
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