Fader Nd II technical issue

[Daddypal]

currently,im using a Fader Nd II 77mm filter .I intend to attach the ND filter with Cokin GND,however the cokin filter ring seen to be to loose when attach with the Fader filter.Anyone has any solution? :dunno:

 

[daredevil123]

currently,im using a Fader Nd II 77mm filter .I intend to attach the ND filter with Cokin GND,however the cokin filter ring seen to be to loose when attach with the Fader filter.Anyone has any solution? :dunno:

The best solution is to use square ND filters instead of the fader ND