How to remove slider legs from old rst suspension fork? I want to clean and lube my old rst suspension fork.  

So far I've failed to separate the slider legs from the frame to clean/lube the inside of the legs.  There is a 4mm hex bolt on the bottom of the slider leg. I tried to unscrew the bolt.  The bolts turn and turn and don't come out.  I had someone compress the fork by leaning on the handle bars, and tried to unscrew the bolts.  Bolts didn't come off.  I tried to unscrew the bolts with a 4mm bit and a respectably powerful impact wrench. Bolts didn't come out.  

Batman suggested that I put a stick into the slider leg to immobilize it while unscrewing the bolts.  I'll do this and edit this question to let you know the result, probably this weekend.  Thank you, Batman.

Chris suggested that I hit the bolt with a wooden mallet.  At first, I thought that I would do this.  But this is an RST fork, and the hammer remedy is apparently for Rockshox.  According to bikepedia.com, my 2004 Specialized Hardrock Sport has an RST Gila TL fork.  Maybe I shouldn't hit the bolts as suggested.
I know that when taking Rockshox forks apart they will often say that you should partially unscrew the bolt at the bottom of the leg and then use a rubber or wooden mallet to hit the bolt. It should free up the lowers from the bottom of the internals.

Once you've done that you may get better luck removing the bolt.