RE: what does transaction.abort() refresh?

OK, things work without retrieving via the root objects when I use thread-specific transaction managers.  So I can go back to my original mental model.  Here's the corrected code:
def tickle(i, me, you):
    start = datetime.now()
    aTransactionManager = transaction.TransactionManager()
    conn = db.open(aTransactionManager)
    if i==1:
        aManager = Manager()
        conn.root.manager = aManager
        aVariant = Variant(1)
        aManager.addVariant(aVariant)
        aTransactionManager.commit()
        print("added variant")
        you.release()
        me.acquire()
    else:
        me.acquire()
        aManager = conn.root.manager
        aVariant = aManager._variants[1]
    aTransactionManager.abort()
    aRun = OneRun(i, start, datetime.now(), 0)
    #conn.root.manager._variants[1].add(aRun)                                                                                                                         
    aVariant.add(aRun)
    print(i)
    aTransactionManager.commit()
    you.release()
    me.acquire()
    aTransactionManager.abort()
    aRun = OneRun(i+2, start, datetime.now(), 0)
    print(i+2)
    #conn.root.manager._variants[1].add(aRun)                                                                                                                         
    aVariant.add(aRun)
    aTransactionManager.commit()
    you.release()
    me.acquire()
    aTransactionManager.abort()
    if i==1:
        conn.root.manager.dump(sys.stdout)
    conn.close()
    you.release()

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