I am trying to make a chain guard that can hold thin oil. It very much looks like the guard on a bike chain. It has to be split in an upper and lower part and it must have a oil tight sealing mechanism on the shafts. Cost is an issue, so the sealing can not be a ,000 solution. The shaft rotates only 1 rpm. I have not come up with the perfect solution, so any hints, links to solutions etc. is appreciated.