Messages

For those who want to see a photo:
https://photos.app.goo.gl/VUfGhgmJfRlXiw6v2

Thanks, baileyuph.  The client and I have decided that a firm cushion will provide the support needed to counter the relaxed springs and I will install a protective decking pad over the springs (secured with velcro over front and back springs) to avoid marking/denting the new cushions. 
Webbing was my first thought too.  Sadly, it is not really an option because it would be visible whether installed on the top or bottom of the seat rails, not to mention that there is no front rail. 
I am going to try to make a photo available through Google Photos.

I tried to attach a photo but just kept getting error messages.  Will compress the photo and try again.

I'm making new seat cushions for a couple of wood frame chairs that have long helical springs spanning the width of the seat frame instead of webbing or front-to-back no-sags.  I've never seen this before and wonder if anyone else has?  I suspect it is a DIY thing.
The springs are a bit saggy and because of the way they are anchored (in recessed holes in the frame) I don't think I can remove them without damaging the anchors and/or the frame.  The client is okay with leaving them but I'd like to see if I CAN replace them.  I just haven't found anything like them through my suppliers or on line.
Anyone know anything about this style of springing a seat?