Here is an Antique Shuttle for Domestic Treadle Sewing Machine with the sliding spring clip . this is from an antique store display case made by  Boye it is NOS ( new old stock ) it is a never use antique original shuttle .these are not made any more . my last 2 pictures show pictures of the display case with the shuttle # and picture of shuttle on case . they are not part of the auction I  just included these for reference to show this is for your Domestic . this will also work on Conquest , Reliable , Newark . which must have been off brands of Domestic this is NOT for domestic rotary  or singer new style which I believe is when Domestic got bought out .  keep your machine running  another 125 years with this ! shipping with tracking to the 50 states is $5.95 thanks for looking / bidding !