We sell quite a few replacement Bakelite handles and what now now, but there are some parts that don’t have enough demand for us to produce, given the minimum quantity we must order for each part we make.
Assuming it isn’t cracked, restoring an old, faded Bakelite part is the only option. There used to be a restoration service (that was expensive) that was an option before we started producing parts, that involved sanding the Bakelite with progressively finer sandpapers.
But we just came across a guide that makes it sound much more simple.
Wipe down the handle with warm soapy water to wash away as much of the grime as possible.
Rinse with warm water and dry with a clean cloth.
Buff away deep scratches gently with fine gauge sandpaper.
Apply liquid metal polish in a tight circular motion with a clean cloth. Rub with as much pressure as needed to polish away the accumulation of stains and dirt. Wait for the polish to haze over.
Rub with a clean, dry cloth to remove the polish.
In terms of what fine gauge sandpaper is required, I am guessing perhaps 200, 400, or 600 grit would be possible options.