Simon, (
www.jaycar.com.au) Have a look in the DC connectors/plugs section for a wide choice. Only 2 wires? Why not a simple 2.5 mm DC plug & chassis socket, that are made for the job? Cost u 'bout... hang on, will get #'s & prices from my cataldog...... Part #ps-0524 2.5 mm bulkhead-male @ $2.65,,, & Part #pp-0511 for the plug, @ $1.55. How's that!
L.
ps. The 2.5 mm bulkhead requires just under a 9 mm hole for fitting.
If the original hole is too big.....Part #ps-0518 @ $1.90, is a chassis mount socket that uses 2 small screws to mount, or use 2 larger washers for the bulkhead 1.