how to keep an object centred on a dynamic block

[jools182818570]

I have done this before but for some reason my mind has gone blank

I am creating a dynamic block of a conveyor belt

it has a set number of widths and needs to be stretchable in length, which I have managed to do

The motor is placed half way down the length of the conveyor and needs to stay centred

I know I need to use the move command and put in a factor of 0.5 somewhere, but I can't remember how to do it

Can anyone tell me, step by step


thanks

[rkmcswain]

Here are some examples/tutorials:

* http://forums.autodesk.com/t5/Dynamic-Blocks/Keep-Item-Centered-in-Dynamic-Block/td-p/3358717

* http://cad-notes.com/2010/10/how-to-keep-attributes-at-dynamic-block-center/

* http://www.youtube.com/watch?v=eV6osOBGCQo

[feargt]

select the action and under properties is multiplier.

you can add a second stretch action to the stretch parameter that you have and select the motor. then in properties select the multiplier and enter 0.5

[jools182818570]

many thanks