While looking through a recent copy of the Stewart MacDonald tool catalogue I noticed an item that would be useful for rigging, among other things. The item is abrasive round cord. For guitar makers this is useful for holes and slots for guitar strings. For ship modellers it would be useful for smoothing the inside of holes for rigging, as well as pulleys and so on.
These cords are available in a variety of sizes. You can get them from Stewart MacDonald and from amazon.com. There may be other sources.
Mitchell Abrasives also makes flat abrasive tape, which should also prove useful for ship modelling.
Their product line is very specialized but you may like to check out the company's web site to see what else they have available.
Mitchell Abrasives
Bill Williams
The Royal Sappers and Miners Plaque
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The plaque commemorating The Royal Sappers and Miners stands at the
entrance to the Royal Sappers and Miners Cemetery on the north side of
County Road 42...