I have a problem with my Shower Spout Diverter. The stem that I pull on the front of the spout to get the water to flow out of the shower head is getting increasingly more difficult to pull up and push down. I have removed the diverter valve and it looks fine. I have put silicone on the o-rings and tried working it to see if it will free up to no avail. I have NO IDEA who the manufacturer of the stem is, otherwise, I would just order a new diverter. Does anyone have any idea as to what I can do?