- Mountings bolts/nuts overtightened during installation(some earlier Tost
releases do not have the mounting bolt bushings inside the hook)?
- Nose-release blocked (had this on an ASK-21 with a sheared off
M6-bolthead fallen inside the release, very hard to find)?
- Actuator-arms of new release not in the same position as before removal
of old release (they are adjustable) causing pre-tension on actuation
cable?
- Dirt/debris in any actuating cable jackets (e.g. Bowden)?
- Wrong hardness mountings bolts (4.6) fitted, distorting bolts?

If release just installed, mounting bolt tightening or actuator arm
position usually to blame.