Best way to convert adjustable shelves?

Thought about Dowles yet?

If you can keep the adj shelf stable enough to drill a small pilot hole straight thru the cabinet into the shelf so all aligns properly, I'd say go that way.

some wood caps can be inserted into the recess you'll allow for in the cabinets wall by sinking the dowle in so it's not quite up to being flush with the cabinets side or back walls. then just push in some mushroom buttons into the holes where you used dowles!

Simple... well almost... but surely not beyond being a reasonable solution.

Screws? So?

That's just another way to go and/or look.

you can get screws with 'shoulders' or sleeves on them too.

there's all sorts of ways to do this... don't get to "paralysis by analysis", with it.

Maybe use shiny metal dowles. perhaps you could take a look around and seek out some solid metal dowles and add onto them some compliant sleeve to aid damping of resonances or vibrations too.

however I'd go with as strongly afixed as is possible... and without a back, and if no piece is to be added there as an additional brace, two per side.

I'd also use a drill guide to insure alignment and equal depths.

Start small with a pilot hole and then move up, to avoid splitting anything. if hard wood dowles can be found or turned down for you, I'd also choose them over the standard ones... but they would do as well actually.

just make the holes a hair larger than the dowles or pins for the adhesive to get inthere.

You are welcome.

I was thinking too, if the side walls of the rack aren't thick, you might wanna think about adding a strip of wood into that area to bolster the support. Merely ripping some or having them ripped and using a very good wod glue ought to suffice. A rear cross memeber too is a thought if you follow that path, although I'd make that piece thicker of course, but still flush to the racks walls.

Good luck