Flyball Throttle

flyball-throttle

A spend-cap widget drawn as a Watt centrifugal governor: two hinged arms with ball weights fly wider as burn rate outpaces the sustainable rate, the sleeve collar they drive slides down the spindle, and the collar's own linkage swings a throttle lever closed over the purchase actions. It reads the derivative of spend, not the level, so 60% spent stays calm on day 28 and flares wide on day 6.