cheekblocks on NS30 wishbone

The leech of my sail has been caught on the flange of the cheek block on the wishbone. This tears the sail which then needs repairing. I would like to replace the existing blocks with a standard garhauer series 40 block.. Has anyone had the same problem if so how did you solve it?

Have not had that problem. Are you referring to one of the leech reef line cheek blocks on the inner face of the wishbone?