Cycling UK Forum

It's not a big deal. Since you can see or hear the void while cleaning/abrading, you know where it is. The patch is adhered to a wider region than the adhesive. If you can't see the hole any longer, a small amount of air in the tube will cause the glue covering to burst or bubble at that precise location, allowing you to see where to centre your patch.

I wanted finned pads as well, and settled on Swissstop 34s, which aren't inexpensive. I bought cheap finless Shimano K03S Resin pads from the LBS for £10 when the original pads were destroyed by fluid.