as u observed at the shield part (red circle) the plastic from the original runner is non-movable.

*source: http://dalong.net/review/hg/h130/h130_p.htm
and here is the ref i got from Bonds site. Plan to make it something like this.

*source:http://barry756.blog51.fc2.com/blog-entry-473.html
this is as, u don't need to remove and replace the joint part. nice idea rite? comment please? hehehe...
stay tune guys n gals...