Help with appending blobs

Question

I have a table that holds multiple blobs i separate rows.
What i am trying to do is have a procedure that will combine all of these blobs in a certain order and insert into a new table.
I have the procedure below which does seem to work except for one major issue: it adds a null character ("00" in hex) between each append in the final blob.
So i end up with the following
[blob1_data]00[blob2_data]00[blob3_data]
I have been searching for a solution for a while and could use some expert help.
Here is what i have:
PROCEDURE INSERT_ATTACHMENT()
IS
CURSOR curATTACH IS
SELECT T.ATTACHMENT
FROM NEMS.NEMS_INET_ATTACH_TEMP T
WHERE T.ATTACH_KEY = pATTACH_KEY
ORDER BY T.ATTACH_SEQ;
blbATTACH NEMS.NEMS_ATTACHMENTS.ATTACHMENT%TYPE;
BEGIN
--combine blob seqments
dbms_lob.createtemporary(blbATTACH, false);
FOR lATTACH IN curATTACH LOOP
dbms_lob.writeappend(blbATTACH, length(lATTACH.Attachment), lATTACH.Attachment);
--dbms_lob.append(blbATTACH, lATTACH.Attachmnet);
END LOOP;
--insert into attachment table
INSERT INTO NEMS.NEMS_ATTACHMENTS
(ATTACHMENT)
VALUES
(blbATTACH);
END INSERT_ATTACHMENT;

Answer 1

Ah yes the version,
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0
Also, i think i may have found a solution. I am going to test a few different files, but so far this looks promising:
--combine blob seqments
dbms_lob.createtemporary(blbATTACH, false);
FOR lATTACH IN curATTACH LOOP
dbms_lob.writeappend(blbATTACH, length(lATTACH.Attachment)-1, dbms_lob.substr(lATTACH.Attachment,length(lATTACH.Attachment)-1));
END LOOP;