You can fabricate your own plastic adapters fairly easily using Friendly Plastic. For example, Prince Neos 1500 doesn't come with any adaptors for racquets with thin bridge (APD, old Max 200G), so I made my own pieces instead of using leather shims.
Friendly plastic softens at 120F, so you can form any shape you want with it. Once cooled, it hardens to Teflon-like hard plastic.
Ignore list: Gimelstob