The Pollywog Accelerator is a bolt-on accessory for your SpinOlution Pollywog spinning wheel. It mounts between the upright and the flyer head, sitting in the drive path between the wheel and the flyer so the flyer spins at higher ratios. With the Accelerator installed, you get 18 ratios up to 43.5:1, the range for ultrafine yarn, lace singles, and thread spinning. What You Get The Pollywog runs 6 ratios from 2.5:1 to 14.5:1 in its standard configuration, suitable for everyday yarn from worsted down to fingering weight. With the Accelerator installed, you get 18 ratios from 2:1 to 43.5:1, opening up the high end for fine, fine-fine, and thread work. How It's Different from the 4A Flyer The Echo, Monarch, and Firefly use a 4A flyer head, which is an integrated flyer with the accelerator built in. The Pollywog Accelerator is a separate bolt-on add-on that works with the existing 4 oz or 12 oz Pollywog flyer head. It exists as a separate add-on because the Pollywog is a budget wheel; building the accelerator into the flyer head would have raised the entry price. This way Pollywog owners can add fast ratios when they need them. Compatibility Designed for the SpinOlution Pollywog spinning wheel only, with either the 4 oz or 12 oz flyer head installed. Not compatible with other SpinOlution wheels. Not recommended in combination with the Pollywog Orifice Riser; the two accessories alter the geometry differently and don't stack cleanly. Specifications 18 ratios from 2:1 to 43.5:1 with Accelerator installed Mounts between the upright and the flyer head on the Pollywog frame Works with the 4 oz or 12 oz Pollywog flyer head Includes the Small Band (Accelerator to Flyer) Raises orifice height to 25 In when installed on the standard 4 oz flyer Material: Baltic birch with elastomer drive bands About SpinOlution SpinOlution spinning wheels and accessories are designed and crafted in the USA. Browse the SpinOlution Pollywog Accessories collection for everything that fits the Pollywog.