The DRBi needs to be “un-weighted” in order to be latched. If there is weight or pressure put on the DRBi compressing the elastomers, it cannot be latched smoothly.
If you are still having difficulty, the DRBi may need adjustment. The supplier may need to adjust the bolt going through the elastomers.
If the DRBi is more than 2 years old, the elastomers may need to be replaced. We have a re-build kit for this, which may be obtained through the supplier.