I find this type of helping hand (made from flexible air nozzle tube) really handy for soldering - https://www.amazon.co.uk/gp/product/B07233QBBS/ https://www.

I find this type of helping hand (made from flexible air nozzle tube) really handy for soldering - https://www.amazon.co.uk/gp/product/B07233QBBS/ https://www.amazon.co.uk/gp/product/B07233QBBS/ . I imagine there are heavier duty ones though, that use a mechanism other than that tubing.