I have the Rowans fitted on my LGV & LGU. They make hell of a difference making the trigger sublime.
When you receive the Rowan trigger you will see 3 grub screw holes. They arrive with 1 grub screw in the front and 1 grub screw in the rear screw holes. Remove the rear grub screw and place into the centre grub screw hole. You then need to make your adjustments with the grub screws so you can now have a short first stage and a nice (like breaking glass) second stage let off.
I also have an HW97 and a TX200 and both the Walthers now have the better triggers.