In the "Hedwig" set (set number 75979) on page 61, it says to use this gear piece. Now I have this big gear, but it doesnt look like it's the right size
CW: HP) LEGO® 75979 Hedwig: Professor's "One Set" MOCs | New Elementary: LEGO® parts, sets and techniques
LEGO 75979 Hedwig Set Parts Inventory and Instructions - LEGO Reference Guide