I'm not sure hard-anodised slies would help. The caarb bodies are basically pot-metal and harder slides would just wear them out faster, Also, as I found out almost to my departure from this mortal coil, the slides are individually lapped to fit the body, I don't know if there's any i/d marks to show that.
I found out the hard way when I rode a company hack 650SS to and from work. When I first started riding it, it had the stock twin-carb set-up. We got a message from Plumstead that they wanted the bike back to do some testing on a single carb set-up that might give the sidecar users better performance.
We took the carbs off and shipped the bike to Plumstead. When we got it back, without the single carb set-up, I re-installed the original twin carbs. I hadn't tagged which slide fitted which carb - never considered they weren't interchangeable. On the way home from work, as is typical of UK traffic, I was working my way between the slow-moving cars. I did a quick blip and pulled in behind a double decker bus. Closed the throttle and found it stuck wide open. Boy, did that get my attention!
Fortunately it was a magneto ignition bike and had a very prominent kill button right by the throttle twist grip. Disaster was narrowly averted. I rode cautiously back to work the next morning and consulted with my colleagues. That was when I learned that carb bodies and slides were a matched pair!
Because the carb bodies are such a soft material, I'd be a bit reluctant to put hard-anodised slides in. The regular brass ones are sufficiently harder than the bodies and will bed themsleves in to give a good fit for quite a while. Hard anodised may wear the slide bores more quickly and negate any improvements.
Must admit, I'm not familiar with the 930, so mybe my comments don't apply.
