While looking for more finishing tools, I cam across these guys:
www.jetsinc.com
I even found longer mandrels :
https://jetsinc.com/categories/abra...-slotted-head-core-sanding-internal-holes-2e/
www.jetsinc.com
I even found longer mandrels :
https://jetsinc.com/categories/abra...-slotted-head-core-sanding-internal-holes-2e/