https://www.ebay.com/itm/Nixie-Tube-Pin-Straightener-for-IN-18-Z5660M-IN-8-GN-4-NL-840-ZM1042-tubes/332737119847
Seems like a really, really risky device to use. In my experience any flexing of the pins is extreme risk of breaking the seal and destroying your nixie permanently.
If you need to straighten pins, better to use a pair of needle nose pliers.
-Dab
