I was thinking it would be nice to find a telephoto lens for my yard-sale Minolta X-700 when I came across an about-to-expire listing on eBay for an XG 1 and a 135 Rokkor for $12. The "as is" labeling did not inspire great confidence as evidenced by the lack of bids, but it seemed worth a gamble at that price.
It seemed there was little to lose by opening up the lens to see what might be fixed. However, I was brought up short when applying my lens spanner to the faceplate ring as the forward tube had a dent in it. The thing just wouldn't budge. Given that, I decided to fall back on the Red Green protocol: Get a Bigger Hammer. I got out my electric Skil drill and a small bit and bored a couple holes in the stuck ring. I then applied a heavy steel pair of dividers and a vice-grip plier to the task. With considerable grunting and straining and not a few scratches to the ring, I finally got it screwed out.
Yes, yes; I am aware of the grimaces and eye rolling going on there in the back rows.
Any way, there is a pretty good YouTube video on the disassembly of the lens. It is fast-paced and I needed to replay parts of it several times in the process to get the lens fully disassembled and then put back together. I did get the focus ring turning, and the aperture settings and dof preview button work as they should. Unfortunately, the video left out the details of how to properly set infinity focus and I haven't yet figured that out for myself, so the distance and dof scales on the lens do not match up with the actual focus. On a rangefinder system that would be a fatal flaw, but with an slr you see what is registered at the focal plane regardless of what the focal index indicates. So, I decided to take the lens and the camera for a test drive, sans faceplate ring.
I'll likely take the lens apart again and see if I can sort out the focus adjustment, in which case I would also jam the filter ring back in place. Without the ring installed the camera under-exposes a couple stops. I'm not sure then how much I would use the lens, but I am impressed by its performance so far. The lens is very compact compared to more modern telephotos and nicely fits the light-weight XG 1 and the X-700 as well. I'll keep a lookout for one with a slightly bigger aperture which would improve viewfinder visibilty. Meanwhile, I think I've gotten my twelve bucks worth.