Hi Derek;
I’ve done that. Try to find a similar size and style in silver or
gold filled. Start by prying apart that one, it’ll inform you on how
the one you want to fix is constructed. On most of these, you can
gently separate the lower portion enough to get the remnants of the
old spring out, replace the spring and squeeze it back closed. If
the broken Lobster is actually riveted together, you can find the
rivet by lightly sanding the area and putting a little iodine on the
area, then drill out the rivet.
David L. Huffman