While in Italy, I did a photo-shoot with the local community of Riomaggiore (Cinque Terre). It was late afternoon and though the sun was setting, it was still quiet strong. I finished my roll of Kodak Tri-x and took the film back to Germany where I developed it.
As you can see, there is definitely a lightleak on the left side, that is because the leak happens on the side the dark-slide goes in.
Fortunately, I can come back and shoot again, but the Hasselblad magazin I bought definitely needs a new seal. I was able to buy a kit on Ebay for under $10. It included:
shaped black special plastic foil
velvet adhesive strip
The kit is made with the best available materials,
and comes with original replacement instructions.
The only tool necessary for replacement was a screwdriver.
I also looked into an option to make the seal myself shown in this video: