Philip Hall wrote:I’m afraid I am one of those who secure the crankpin nuts on crankpins with a tiny touch of retainer. My belt and braces reasoning is that most of my engines go to new homes and I’d rather not have a customer coming back with an engine that has tied itself in knots because something has come loose over time.
That, in a nutshell, is the professional approach. You build them, you don't want them to come back. When they come back (for repair) that is un-remunerative time.
Personally, I try and build in the same way. Build once, build right (though I don't stick the crankpin nuts on!). My locos are expected to do quite large distances, I did a survey at the Peterborough show back in 2010. Some of the trains ran round the layout 36 times in the weekend, travelling 1,260ft, or just under a 1/4 of a real mile. They were expected to do this without failing. I did the survey in response to Roy Jackson's article 'Locomotives of Dunwich' MRJ 18 - which makes interesting reading.