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
foam
velvet adhesive strip
Instructions
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: