I noticed this when I changed the bars on my bike a while back; it was quite hard to loosen the clamp, and when I reattached the levers, the bolt was a bit 'sticky'. I took the bolt out completely, sprayed it with WD40, scraped a few bits off with the end of an electrical screwdriver, and reinstalled it. It's not a big job.
I've noticed exactly the same thing on Pro stems over the years.
I noticed this when I changed the bars on my bike a while back; it was quite hard to loosen the clamp, and when I reattached the levers, the bolt was a bit 'sticky'. I took the bolt out completely, sprayed it with WD40, scraped a few bits off with the end of an electrical screwdriver, and reinstalled it. It's not a big job.
I've noticed exactly the same thing on Pro stems over the years.