If you have not got access to a slide hammer a bolt will do. I made a slide hammer, not difficult, as I had a few to take out. You can get the guide pin out with an M6x30mm bolt and a short piece of 15mm pipe about 25mm long. Put a washer over the end of the pipe and screw the bolt through it in to the pin. Should act like a puller and draw the pin in to the pipe. When replacing oil well and tap in to place.