Samantha, I do them all the time; and, yes, sometimes the ribs break.
I can send you an article I wrote about dating, and measuring and recovering your parasol if you PM me with your email address.
Please, though, I beg you... pick a silk as close to the original as possible, make sure it is NOT duppioni.
Because it has wooden ribs, if it has trim, it will be fringe, not ruffles. Ruffles are from the '60's and wooden ribs were out by the late 50's. If it's tiny, it's '50's, if quite long with a long finial, it's earlier.
And if you get an American Marquis (all black tilting, etc.) Please, please, please recover it in black. That's what color they were until well after our period!!!!!!!!
I'm Sorry, but this
is my soap box! When I see a reenactor who has spent a great deal of time and attention on making sure her dress and undies are PERFECT, and then she goes a bit haywire with her accessories, it makes me wonder if she really got the message! It's kind of like someone who goes to a function in a tux and then wears a cowboy hat and has a bandana around his neck! Or a woman dressed to the nines, sporting her diamonds wearing white gym shoes!