well it arrived last week in the post and now with help from Houghy its installed
picture below shows the old and new side by side
obviously no first light thanks to the weather but
first impression is that while it is very well built the coarse focus is actually not as smooth as the old focuser.However the fine focus is smooth enough
I like the lock mechanism I felt that with the old focuser there was slippage so hopefully this cures that issue