After I use sinker slides for five or six fishing days, I notice they start to get grooves cut into each end of the slide. I worry that these grooves could potentially cut my 40 pound mono and at the very least quit functioning properly and not sliding anymore when the fish takes the bait. I saw on Ebay a different looking slide that looked like a glass bead with a swivel attached for the sinker. The main line goes through the glass bead. Has anybody used these or is their a better source for sinker slides than the ones I am using? Thanks.