You're in luck if it's anything like mine, I just rebuild an older Weaver S29 and it's easy. Everything I say applies to mine and may or may not to yours. Is it nitrogen purged? If so you'll be letting it all out.
On mine there was a little bit of soft, black sealing substance that scraped off the threads. Next there is a threaded ring with two notches, I used 2 screwdrivers to unscrew the ring (large snap ring pliers may work), there was a fiber washer under the ring acting as a buffer btw the metal ring and the glass. I turned the scope on end and it fell out.
If you want to go the rest of the way, I unscrewed the eyepiece and was able to push the rest of the components out from the eyepiece end. PAY ATTENTION TO THE ORDER AND ORIENTATION (flat side/curved side) of the lenses and washers. I disassembled mine to replace the crosshairs that were gone; ( a little bit of super-glue, a few of the finest blond hairs from the nape of my daughters neck, and a black sharpie and I have new crosshairs and clean lenses. Now I realize that I could have bought crosshair wire from ebay.