My clutch lever was about like that. In the attached photo taken when I started the latest restoration you can see that I'd previously painted it to hide the missing chrome and rust. The platers masked the splines so they were not affected. I was lucky to find a platers in the Midlands who specialise in vehicle work. They do good work. I also had them do the plunger shrouds, petrol tank, kick start and gear levers. I don't think they have a website. Here are their details.