Weller EREM has a sharpening service for their different cutters. If you need your tools sharpened then go to https://www.weller-tools.com/professional/USA/us/Top-Menu/Contact/Contact+form
USA Weller Repair Center 1000 Lufkin Road
Apex, NC 27539
Toll Free: (800) 476-3030
Fax: (919) 387-2640
Here are a couple of snips from the supplier’s site for reference.