I have a Unertl 24X Programmer that was all bound up with old dried oil, plus it had a cross wire w/dot reticle.  I sent it to Iron Sight in Tulsa Dec. 20th. for cleaning and reticle change.  I got it back around the end of April but the USPS did a job on it.  I sent it back to Iron Sight and now have it in hand.  Beautiful work, invisible repair to the PO foul-up, and now it works perfectly.  All for $125. (Except shipping from my end.)
From their website:
Clean and service includes disassembly, clean and reassembly – relamination of lenses if needed, replacing sealing components if needed, function check and purging with nitrogen. Needed parts will be discussed with owners before proceeding.
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They will have all my future work.