I'm reinstalling the upper control arm, with new bushings, on my 1983
Westphalia, and there is something I don't understand about using thicker
slotted washers to take up play.  The references I've seen(in the list
archives) to checking  bushing play(slop)  don't make sense to me.

ie...."the bushing shouldn't have more than .020" slop side to side before
you tighten the bolt"     What kind of slop is this?  The bushings fit
tight in the holes that they are pressed into, so no slop there.  The pivot
bolt is a little loose where it passes through the bushings, but I don't
think this is the above mentioned "slop".  If you grab the upper control
arm, with the pivot bolt nut loose you can move the bushing end of the
control arm left and right a little...that could be it but it doesn't seem
like a thicker slotted washer would prevent the left and right play.

Can someone enlighten me on this?

Thanks,  John