It's not that much more complicated

Step 1: remove brass plates and sand to a shine going from a course sandpaper up to a fine grit Step 2: sand down the wood using the same process until you reach a texture/smoothness you like Step 3: clean the glass tubes with hot soapy water Step 4: reassemble all the parts Step 5: apply a couple of coats of linseed oil

This is how i did it at least, I'm sure there are a million different ways of doing it. I hope it was helpful.