Fox Collectors

I have 2 16 ga Sterlingworths. One, 35455x built in 1918 and the other 36280x built in 1927. I don't use either of them because my go to gun for birds is an A grade 30364x built in 1936.

If anyone is interested...... ... I found one and the sear springs are the same size !

I have a 20ga Sterlingworth built in 1924 that has a broken sear spring. Where could I locate a sear spring and would one from a 12ga also fit a 20ga? Thanks for any help. Bob