You have a problem with the allen hey key screws in your XC fork crown or your XC fork leg tubes?
One or more screws are :
The solution is this service about hart metal drilling, milling and using a welder to be able to get the stucked screw out. Defect threads can be repaired in most cases using HELICOIL inlets.
Drop me a note with photo and full repair history, please be honest!
End price depends on the necessary work load + material to fullfill this task.