81 240D, crank windows, just replaced the window regulator on the passenger side, after finishing, forgot to install the regulator guide jaw, I don't feel like pulling the regulator out to install this piece unless it was absolutely necessary, thought?

What is a guide jaw?

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg