Save drawing as PDF with revision from model

I know this has been answered before (probably many times) but I'm not a programmer and can't seem to make this work.  Basically all I need is a macro that will save a drawing as a PDF using the file name from the drawing and the revision from the referenced model (custom property called "Revision").  What I have used is shown below and it works fine but isn't setup to pull the revision from the referenced model.  I have tried a number of different ways to pull that custom property but just can't get it done.  Any help would be greatly appreciated!

Dim swApp As Object

Dim Part As Object

Dim longstatus As Long, longwarnings As Long

Sub main()

          

Set swApp = Application.SldWorks

Set Part = swApp.ActiveDoc

Part.ViewZoomtofit2

sPathName = Mid(Part.GetPathName, InStrRev(Part.GetPathName, "\") + 1)

FilePath = Left(sPathName, InStrRev(sPathName, ".") - 1)

FilePath = "C:\Test" & FilePath

Rev = Part.CustomInfo2("", "Revision")

Part.SaveAs3 FilePath & " RV " & Rev & ".PDF", 0, 0

End Sub

SolidworksApi macros