EXHIBIT A


                                   PROMISSORY NOTE

$10,809.18                                                    January 24, 1994


          For value received, Michael J. Stone ("Executive") promises to pay on
January 24, 1999 to the order of USAI Acquisition Corp., a Delaware corporation
(the "Company"), at its offices in Clemson, South Carolina, or such other place
as designated in writing by the holder hereof, the aggregate principal sum of
$10,809.18.  This Note was issued pursuant to and is subject to the terms of the
Senior Management Agreement (the "Agreement"), dated as January 24, 1994,
between the Company and Executive.

          Interest will accrue on the outstanding principal amount of this Note
at a rate equal to the lesser of (i) 8% per annum or (ii) the highest rate
permitted by applicable law, and shall be payable at such time as the principal
of this Note becomes due and payable; provided, however, interest shall cease to
accrue upon the date on which a Repurchase Notice is delivered to Executive
pursuant to Section 3(c) of the Agreement.

          The amounts due under this Note are secured by a pledge of 1,082
shares of the Company's Common Stock.  The payment of the principal amount of
this Note is subject to certain offset rights under the Senior Management
Agreement.

          In the event Executive fails to pay any amounts due hereunder when
due, Executive shall pay to the holder hereof, in addition to such amounts due,
all costs of collection, including reasonable attorneys fees.

          Executive, or his successors and assigns, hereby waives diligence,
presentment, protest and demand and notice of protest, demand, dishonor and
nonpayment of this Note, and expressly agrees that this Note, or any payment
hereunder, may be extended from time to time and that the holder hereof may
accept security for this Note or release security for this Note, all without in
any way affecting the liability of Executive hereunder.

          This Note shall be governed by the internal laws, not the laws of
conflicts, of the State of Illinois.


 /s/ Michael J. Stone
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                              Michael J. Stone