How to replace a roller section - page 1
Replacement roller sections are available that will fit all brass frames we have made over the years. They will also fit the brass 'horse shoe' frame. These frames have 3/16" diameter spindles which are more or less a UK standard.
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Here is a poor old 'horse shoe' frame covered in ink and soft polyurethane complete with a loose handle ferrule. Before I replace the roller all the ink and other stuff must be cleaned off the frame. I use one or more of the following tools and chemicals:

wire brush
paint stripper
paint stripping gun
gun wash (more about this later)

I first remove the steel spindle and inspect it for wear. These spindles are 3/16" in diameter. Heavily worn spindles should be replaced. Here you see my well used wire brush ready for action. You could use an electric drill with a round wire brush, but be careful, on this type of brass frame the brass is very soft and easily marked.

I fit this frame into a vice and remove any loose ink and soft polyurethane compound with a wire brush.

Notice the ferrule is loose - more about this later.
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Refill roller page
Page 2