A postscript.
Legally and financially, I took the matter as far as I was prepared to go. A lawyer's letter of demand or debt collection services would be equally ineffective in this instance.And, such systems are, as the others here have indicated, ineffective for small amounts. According to my solicitor, I had 'fallen into' a contractual or legal 'grey area'. As well, small claims court proceedings would, she claimed, very likely incur the displeasure of the small claims court judge, while providing an outcome of dubious worth.
Based on legal advice, I have changed my contract to deal with similar, future circumstances. In turn, I have decided to deal with this matter of significant amount of time required for a lengthy article and attendant costs upfront in future, initial negotiations with editors.
No matter how scrupulous you are in your dealings, there is no way you can compel a publisher and/or the Financial Manager to undertake due diligence if they choose not to. Or even observe a contract.
Grey area or not, my signed, dated contract did not prevent me from being taken - at least in this one aspect. Given the attitude of the publisher and Financial Manager, had I not had any such contract, I am very sure I would have had the entire amount withheld. Indeed, during my discussion with the Financial Manager, concerning this issue, following her approval of release of most of the payment, she did an about face, and suggested that she withhold the entire sum 'until the matter had been further discussed with the publisher'. Had it not been for the quick actions and deposit by the Accountant the previous day, the FM would have had no compunction in making me do the "bend over".
With the nature of this one publisher, persisting as in dripping water
I estimated would have proven a waste of time. Given the small return on this particular piece, the size of the amount outstanding (USD165), plus the cost over-run to obtain a cheque of a smaller amount from another debtor (I did finally get the cheque, but it was accidentally addressed to the wrong bank), I decided to simply 'wear the cost' - in all, around USD200. Additional time expended on debt collection for these pieces would have further reduced earnings or profits.
Overall, my first experience in debt collection and making provision for bad debt has been a catalyst for examination of my methods of operation in a number of other areas, and I am now very much focused on implementing changes. Fortunately, I have established a relationship with another client that has so far proven very beneficial, and has helped more than offset the provision I have had to make for bad debt.