Connector type on Hornby C912?

[Hesperus]

Years ago I bought some electrical connectors which are the same type as used between the C912 transformer and various Hornby and Scalextric controllers. 

 

I thought I'd managed to get hold of some more but they are slightly different and don't fit.  I could do with some as one of my layouts uses them to connect the cassettes to the layout and the controller to the cassette. 

[melmerby]

Hi

Coaxial power connectors come in many size combinations and you need to know both the pin diameter & outside connector diameter to get a compatable combination.

Unfortunately some are close matches but wont mate properly

 

See the options here:

https://en.wikipedia.org/wiki/Coaxial_power_connector

 

 

[Hesperus]

Thanks for the link Melmerby.  After a bit of fiddling around sticking drill bits into holes to measure pin sizes I think it's 2.5x5.5mm so I've ordered 5 male and 5 female for 3 quid off eBay that will probably be useful for something even if they aren't right.