Hi guys, so i bought my first ever vintage camera and its zenit et. its a used camera and the condition is good,but after changing it to my 4th film i.noticed that theres no resistance in the film roll lever when i shot 3 times. so i continue shooting it until i felt the resistance but my film just runout. im on my 6th film and still.thesame. do you guys have any idea what to do or how to fix these thing at home? i wish you could help me. thank you.