Tape and reel seems to standardize on 4mm sprocket hole spacing (but not sprocket hole shape?) - this matches Super8 film by the look of it - find an old scrap Super8 projector mechanism maybe??
Tape and reel seems to standardize on 4mm sprocket hole spacing (but not sprocket hole shape?) - this matches Super8 film by the look of it - find an old scrap Super8 projector mechanism maybe??