You don't need to worry, that your boom with SDM front-end doesn't work with reduced diameter mast (RDM). Unifiber Adapter solves the problem. With this small piece, you can attach your boom to RDM mast. Rubber pad protects your mast from scratches and gives additional grip, so your boom fits tight, like without an adapter.

Unifiber Adapter is perfect for Unifiber Slim, HD, V-Grip, Carbon PP and Gaastra Black and Green booms.