Keep us posted on this rebuild. As I mentioned earlier the body of the valve appears to be a bake light material which may be perilously brittle?

Did you happen to measure voltage on this yet?

__________________
1995 E300 (W124)
1999 ML430 (w163)
2011 GL350 (x164)
2016 Sprinter 144" 4X4 lowtop (906)
2004 E500 (W211) 4matic Wagon (Gold)
2004 E500 (W211) 4matic Wagon Avantgarde (silver)