Bonneville T100 Spark Plug Cable Question

Bonneville T100 Black 2015

When I was removing the SAI I accidentally pulled the ignition cable from the plug cap. I pushed it back on to the spear thing in the cap and all seemed fine. I assume it's not meant to be able to be pulled off that easily and so should I cut off a cm or so from the end and reattach? I can't see any metal conductor wire in the plastic tubing?
I've ordered a pair of black NGK caps to replace the stock red ones so I'm going to have to reattach them anyhow.

Any advice much appreciated, thanks.