[MiraclePieCo]

I've installed Teflon liners. They're easy to install and work well, but they wear out relatively quickly. They call them Teflon, but I think they're really just plastic.

If you don't want to drill out the stock springs to accept slider buttons, just buy Speedway springs that already have the buttons installed.
Or go with the Posie's. They're great quality, but I'd just rather not have those non-original bumps on my springs.