Decorative Roof Bars

It has probably been previously discussed but I can't find it using the search engine, has anyone removed the "waste of space" decorative roof bar dirt collectors from a Warwick XL.  

If so, how is it done, do the securing screws/bolts penetrate the roof and are they fixed in an encapsulated thread or is there a nut underneath.

I do not see the point of these, it is hardly aesthetic when the awning obscures the nearside roof bar.

its on my kemerton xl improvement post
It explains the removal and no DAMAGE to roof

.... and this post contains more helpful info and images from Glyne:

[You must be registered and logged in to see this link.]