The 7th and final volume is now out for Kindle. The previous volumes are also still available for Kindle. The concept is taking characters whose initial stories were basically retooled reprints featuring different characters. In some, the changes were mostly cosmetic with a change in the name. I write the stories featuring the Ajax-Farrell Black Cobra. One of his stories was a retooled version of a Chesler Black Cobra story. Another featured a splash page taken from MLJ's Shield. My stories are in all but #6 of the series. In each one, I try to do something a little bit different, usually inspired by a different writer. In this case, I focus on the POV of the villain, an assassin given the assignment to track down and kill the Black Cobra.
https://www.amazon.com/dp/B09SY99TXH/ref=cm_sw_r_fa_awdo_KM6RPBY5WENMPB20N94D?fbclid=IwAR13LI5zvOWFB_x0wvOAnHChgqGfvs22U5bjTfQZ41_esLuw4fpxdN2SIuY