search for: myarglist

...also not an option, since my call to "new" includes an argument not in the constructor (i.e., my equivalent of makeC). I suspect there's something I could do to get the constructor arguments, modify the list (i.e., delete args that were missing and insert new ones), and do.call(new, myArgList). Not only am I unsure how to do that (or if it would work), I'm hoping there's a better way. What's the best approach to this problem?