On the side that i took the photo it is loose because i can see the thread twisting as i move the caliper, it just wont slide off so maybe some heat on the caliper and a hammer will get it off.
Although at the other side it is solid after ive taken the top caliper bolt off, i can lever it down but its solid.
Im afraid of destroying the threads for the bottom pin to screw into if i hammer the caliper, have people cut these bottom pins off before with a grinder to replace them?