Here is something I seen yesterday which could get someone hurt so I'd like to pass it on , I was resealing a cylinder on a JD 450G , the pin on the rod end side was frozen up really bad at the rods end , I had got it to break loose from the mounting ears on both outsides , you can't get to the back side and hit the pin so I did a few things to get it out , I welded a nut to the end of the pin and was using a slide hammer which didn't move it so I hit it with some heat , I didn't remove the grease fitting from the end the rod and spray some penetratig oil down the journal which I would normally do , well after heating it up it went off like a black power rifle , there was an explosion which blew out the ball which seats the end of the grease fitting (zerk) and a cloud of smoke blow up out the fitting like a volcano , if the ball would have been pointing at me I think it would have been like getting shot , I never seen anything like that happen before