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bit of prop-making last week for our Steampunk Festival at Chepstow in May, the Waltz on the Wye
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're 4mm ply and MDF, laser cut to shape as cogs and gearwheels. Some of the more complicated cogs are made from stacked layers, to give hubs and rims. Most are just static set dressing, but a few of the larger ones will be meshed up and turning. The sizes are from about 8" to three foot.