how to get append to command option to append as literal, than as new option?

When I type in a command with the "+=" operator, it seems to
appended the new text separated by a comma -- which is probably
what is normally wanted, but in this one case, wasn't....I wanted
to append the new text to the existing string -- literally, not as a new
'list value'...
(since for 'guifont', adding a new list value, isn't too useful on
windows, AFAIK).

I.e. I had
'Lucida_Console:H11',
and I wanted
'Lucida_Console:H11:W6'

so I tried
:set guifont+=:W6
instead of what I wanted, I got:
'Lucida_Console:H11,:W6'

(which doesn't work...)...

so is there a way to tell (or is there a different
operator I should use) to tell it to append as
literal vs. as a list item?

Thanks!
Linda

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