Custom made back spring for Workhorse Irons machines (like Weiner Dog Liner, Fastback Liner etc.), that have an extra short back spring. Workhorse has made these from regular back springs to make spring replacement also on these machine models easier for your convenience.
PLEASE NOTE! These are standard pre-punched springs and some adjustments (like cutting the spring to the right shape/size) need to be done for spring to fit different machine models.
Also may not be compatible with some custom one-off machines made by Workhorse Irons.