Smok Mag 225 tc. Issue. Can someone help pllease!

So Ive been having a problem with my mine. the trigger wont fire? It doesnt seem stuck. I cant get a full pull off of it but for 2 secs. After pushing/holding down on it this way and that. Please Help!

Plus. The screw for the buton that releases the batteries is too tight! Im afraid if I try at it anymore lIl strip the screw completely.