I found some pogo pins with round ends, thats why they have to come from China. I did think about bronze wire springs, i just thought the pins would look neater and more pucker. I would still like to make a probe switchable, but am still not sure how I will fit the switching especially the switch on the probe head. Most probes seem to have a reed switch in them so if I can fit another reed alongside that might be the way to go. I have some cheap probes coming in order to take them apart, no point in ruining good ones until I have the methodology sorted.