Hi Mike, per our vendor, this spring clamp is estimated to be back in stock around the end of February with limited inventory, which is subject to change. If you would like to be notified with updates on the status of this item, you can enter your email address into the field provided on the product's page. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot!
This model does not have the adjustment screw feature. I suspect you've already looked, but if you can find the model number on your clamps you can find them on this site or others. Good luck.