Thunar and Custom Actions

[Frank Murphy]

If I mount a phone using
Xfce-Terminal as user:
obexfs -b xx:xx:xx:xx:xx:xx /my/mount/point

Open thunar,
on the left
DEVICES

File System
MYPhone

Second button click
on MyPhone > Disconnect

Failed to eject "MyPhone"
umount: /my/mount/point: Permission denied

In Xfce-Terminal

fusermount -u /my/mount/point

It's disconnected/unmounted.

How can the custom action be changed from umount to fusermount.

can not find relevant entry in thunarrc, uca.xml

___
Regards
Frank Murphy