I have a siemens solenoid drain pump in a bosch machine that is sticking. The problem has been trace to grit inside the axle core enclosure. I think I can fix it if I can gain access to the magnet axle and remove any debris. I yanked as hard as I dared on the axle to no avail. Anyone has experience of OEM to know how the axle is sealed? Around the axle is a round piece of plastic that is not part of the housing. What is this entire unit called and is that buyable? If I have the name, I might try china.