>>If calcweight is a field, you can not write "calcweight=use_size*use_size*blunt*.222" to update a field.

>>Replace calcweight with use_size*use_size*blunt*.222

>
>Using Replace wouldn't be appropriate because calcweight isn't a field in a table.
>
>>Or if calcweight is an object, you must write

>>calcweight.value=use_size*use_size*blunt*.222

>
>Where would I place this? And do I need to change anything else I mentioned originally?
>
>Thanks!

Personally I would write this.value=use_size*use_size*blunt*.222 in the refresh method of the object itself. Put the code locally where it belongs.