What a delight, Marie, to get out of bed this morning and find your positive response to my 'pleading' message. Whatever you can do will be gratefully appreciated, and costs will be forwarded to you. I have written to Manx Museum & Library as I understand it is there that wills are located. I found Hugh McCarthy listed under Brian Lawson's wills index.
I have searched for Mary McCart/McCarthy/Downey (my great grandmother) for over 20 years and now think she is 'coming to life' for me. She arrived in Australia mid 1850s