Selection Set processing problems

Our office has a requirement to set our dashed/hidden/center lines up
to work when a consultant changes the ltscale of the base drawings
from our standard 1 to their standard 40. I thought that a good way
to do this was to change all of the lines' ltscales down by 1/40th of
their original.


I have never worked with selection sets before and I am having some
real difficulties getting the selection set to cycle through all the
lines in the drawing

I think that this gets all of the lines in the set.

(setq zzSet (ssget "X" '((0 . "LINE"))))

And the function below is working to change the ltscale of an
individual entity.
( this uses a lib-dxf function out of "maximizing Autolisp" and Reini
Urban's
STDLIB)

How can I feed one entity at a time to the change function?
Any suggestions will be greatly appreciated.

Zac.





;; Function to change the linetype scale on an entity
;; We assume that the ltscale of the drawing is set to 1 and
;; that it will be changing to a new scale factor
;;
;; example: a drawing changing from ltscale 1 to ltscale 40
;; (lib-convert-liene-lt 40 Entity)

(DEFUN lib-convert-Line-lt (zzLT zzEnt )
(setq zzlt (/ 1.000000 zzlt))

(if (/= 1 (lib-dxf 48 zzEnt))
(progn


(setq zzFactor (* (lib-dxf 48 zzEnt) zzlt))
(std-entchg zzEnt '("LINE") 48 zzFactor)


); End progn
); End if

); End defun