Couple of things - as reflected in another thread here - I've heard that a large/heavy bunch of keys can cause issues as it put undue strain on the internal mechanism.
If you have to replace the ignition barrel, have a look at MGB ones - I replaced mine a few years back and the MGB one was virtually identical and a fraction of the Morgan price.
Getting the old one off can be a little tricky, but I drilled and snapped mine out - if you get to that stage let me know and I'll let you know what I did.
"Y mae dafad ddu ym mhob praidd" 1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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