Hey my father in law has and older (probably from the 90's) Jong Maw porta power. Does anyone know were we can get seals for this unit. We mainly need the cup seal for the piston in the 1/2 ton spreader, but a source for all of the seals would be nice. I have looked all over the internet and have come up empty, We also called harbor freight and they do not sell seals for their units which appear to be the same cheap chinesium stuff. 