Don't forget that the majority of time you'll benefit from dismantling the actual solenoid and reconditioning too.
Unfortunately the guide I wrote for another forum is without pictures but the basics are as follows.... and If i find my old spare EGR solenoid ill take some new pics.
1) Remove EGR from car.
2) Remove EGR solenoid from EGR valve.
3) Make a tool to help ease removal (drill a 25mm hole in a piece of wood)
4) Attach solenoid to wood above the hole.
5) Drill a 4mm hole in the top of the solenoid.
6) Using a punch gently tap the pin of the solenoid out using the hole you just drilled.
7) Remove solenoid from piece of wood.
8) Make sure to keep all pieces of solenoid SAFE!!
9) As you can see from this picture the insides of the solenoid are really rusty and pitted.
10) Use some emery cloth to remove the rust and the worst of the pitting from the pin.
11) Also clean up all the other parts of the solenoid using emery cloth and some brake cleaner to get rid of the dirt.
12) Apply copper grease to pin, to help it not to get rusted again.
13) Also apply copper grease to the insides of the solenoid.
14) Go root in your drawers to find a tool
15) Reassemble the solenoid.
16) You will need to tap the pin back in gently till it sits flush.
17) Your solenoid should now look like this, and the pin should be able to be easily pushed in and spring back out.
18) Your solenoid is now fully reconditioned and in a usuable condition.
19) Refit EGR valve to car, making sure the connector is on properly.
Note: when using a powerdrill take extreme care and use the neccerssary PPE.
