For anyone else looking needle scale heads are generally available for electric chippers or scalers. Chippers/scalers are heavy to use (typically 5 to 7kg) and are a real handful. Not a hope in hell of ever seeing a cordless with decent run time in the foreseeable future (or ever?), either. The best option in terms of weight and power are pneumatic scalers such as the Trelawny, but they require a biggish compressor (15 to 20 cfm) - any less and you don't have enough air. The adaptors for small lightweight pneumstic chisels are so small and that it really affects how long it takes to get the job done. I suspect that a converted chisel with a needle scaling head wouldn't last long if used for "scabbling" as they just arent tough enough