Hey Guy, There is a safe way to get them out without drilling. You can tap them, screw in a piece of all thread, use a piece of tubing or a deep socket with 2 washers and pull it.Don.t use an impact wrench, just take your time and do it by hand.I built VW engines for 30 years, probably pulled a couple thousand like this. as far as putting them back in. lube them with antiseize compound take a 5/16 x 1 1/5 allen head bolt with a tight fitting washer use a round nose driver and vibrate them in with an air chisel at low pressure. there is a shoulder on the guide, leave about .010 to .015 clearance between that and the head boss.don't try to press them in. use this method and you will have great results. Jeff