Lyman scope

I need the cross hairs repaired on a Lyman scope. Any recommendations as to whom I should contact?
Thanks

which vintage and type?

go to
https://ironsightinc.com/index.php?route=common/home

I had an old Lyman 438 scope refinished, cleaned and new cross hairs done by Ironsight Inc not long ago,
excellent work, cost was around $125.00 and well worth it