Tormek support pointed out that their authorized resellers carry replacement parts. This shaft for the LA-120 set is available by itself.
Here's a US link: https://www.sharpeningsupplies.com/Shaft-for-LA-120-Profiled-Leather-Honing-Wheels-P2085C370.aspx
At $25.50, this was the best option for me. Thanks Ken and HaioPaio.
Here's a US link: https://www.sharpeningsupplies.com/Shaft-for-LA-120-Profiled-Leather-Honing-Wheels-P2085C370.aspx
At $25.50, this was the best option for me. Thanks Ken and HaioPaio.