The gypsy/wildcat/chainwheel on your windlass
is sized to fit one specific size & type (calibration*) of chain.
* Calibrated chain is chain that is made to internationally accepted standard dimensions with close tolerances. The two common specifications are DIN 766 Calibrated Chain, and ISO Calibrated Chain. The difference between the two specifications can be 2mm or more on the inside pitch
of the link for the same diameter chain, which over several links (if the wrong chain was fitted) would cause the chain to jam or jump out of the gypsy.