I am considering buying a used Makita mortiser and understand the chains are very expensive ( around $500) so am interested in sharpening options. I usually pay to have my chain saw blades sharpened since the results are far superior to what I can do myself and expect the Makita chain to be even more difficult. Are there people who will sharpen for me and what does it cost? How many times can you get a chain sharpened? The unit I am looking at is $1100 so the price of a new chain would be equivalent to a new unit. Thanks, JimWood