Yes, if you used a magnet to remove the pintle below the spring, the actual delivery valve could have come out of the guide pin on the main rack. you may disassemble down to that valve & see if you can re-insert the valve back onto the rack..if not then the pump will need to see a BOSCH service repair center.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator