Prop base location and variables

I use the same engine in multiple different custom vehicles and where I get hung up is on the props for the rotating engine pulleys. Does anyone know if there is a way to use variables for a baseLocation modifier for a prop?

I have a separate .DAE file with my engines, and common jbeam files for each, all of which are at a 0, 0, 0, x,y,z placement. I then have an engine placement x,y,z variable defined in each of my different vehicles to properly locate the engine in each car, and this worked well for me until I updated my engines with rotations pulley props. If I try to use my engine placement variable anywhere within the props definitions, they just show up at a 0 coordinate in the game. My work-around has been to create a slot within the engine to select which vehicle's pulleys to use, and to create multiple sets of pulleys in the .Dae file placed correctly for each different vehicle, but I hate the duplication.

Anybody know of a way to use a variable to adjust prop placement?

 

Yep, that was it. I had to do prop location in blender minus the reference node location to get the pulleys placed correctly. I had assumed that I would have to offset the props with the engine placement variable, but nope. Thanks.