Stretch dynamic block and keep center dot in center even after a stretch

[jorgeseptien]

Attached is a block that I am using for Finish plans.  Basically how it works is that it is suppose to be inserted and then stretched to indicate a finish change in the floor.  When I insert it and stretch it, it works exactly as I want it, but when the scale is changed, the center tag resets to the original center before the block is stretched.  I would like it to stay in the center relative to the line that is stretched.

Not sure if you understand, but if you are good with dynamic blocks, please let me know if this is even possible.  You will notice that the dot is annotative where as the line that stretchs is not.  I cant have the line change because it will be stretched between two areas with different floor finishes and that will stay consistant.  I want the block to adjust so that it is the same size on all the scales of the drawing.

Let me know if this is possible.

Thank you all in advance.

[Libbya]

Here's another version that adds rotation to each endpoint grip while keeping the circle centered.  It picks up where the last screencast left off.  

[zhaohui.chen5TEA7]

Wow, this is perfect!

Thanks Libbya.

[zhaohui.chen5TEA7]

My new challenge is: 

how about have arrow head at each end of the line?

[Libbya]

The last two screencasts I posted will work fine for that as well.  No difference.  If you have trouble, post your block.  

[zhaohui.chen5TEA7]

Thanks Libbya!

My problem is that I couldn't make the end arrows stretching properly. please refer attached dwg. Thanks.

[Libbya]

Ok.  See screencast.

[zhaohui.chen5TEA7]

Cool !  I got it. The trick is to make the arrow at the other end "rotate only" object with the polar stretch action.

Thank you so much Libbya!

[Anonymous]

Thank you! This is simple and exactly what I was looking for!