I'd say buy new posts. Those look like plug adapters. That or someone drilled out the poppets.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk
Simgo.comReplacement Parts has an exploded view for different models.
You keg does appear to be modified.
Possible parts list here:http://www.chicompany.net/images/Temppics/Spartanburg%20Transfer%20Tank%20Catalog.pdf