I would just buy a new switch for it.
Here's an OEM from a trusted vendor.
https://www.messicks.com/parts/kubota/66706-55120
This one is probably a Chinese knock off so no telling what you'll get.
https://www.amazon.com/Mover-Parts-I...3216797&sr=8-3
There are lots of upgrades that should be done to these machines.
Gear reduction starter
https://www.onlycubcadets.net/forum/showthread.php?t=1
Glow plug upgrade
https://www.youtube.com/watch?v=8dDsTR_giIU
Here is the schematic for the 1572 along with a bunch of others too.
https://www.ccpartsnmore.com/cub-cad...ing-schematics