I am looking for a lightweight c-system accordion, ideally with free bass. I don't have the best back for playing accordion. The Pigini Studio B is the lightest I have found that offers LM in the right hand. Are their others? Would stradella systems be lighter in weight? I have found lightweight free base instruments with only one voice in the right hand, including Pigini Peter Pan and Ellegaard Special, which may also have been built by Pigini. Are those suitable for an adult (sizewise)? Any suggestions appreciated.