I tried it with promising results
I think its (for me anyway) not so much about the money, its that the friend in question does not value my friendship or respect me enough to pay it back, or if she cant at least make contact and try and sort something…… Shes has been avoiding me for a long time, and so yeah thats a bit disappointing when someone you thought was a good mate, decides avoiding fronting up with a few hundred is more important to them than retaining your friendship (and I told her she could take as long as she needed so it is not that she does not have it – she has money to buy other things I cant afford!)