This morning I got a 5mm chunk of glass in my tire which produced a flat. The gash in the tire was 5mm long and I had to dig residual glass out of it. While doing this I pulled the gash open and it looked like the tire was cut enough to expose the strands present in the next layer. I was able to replace the tube and ride home (I was just about 1km away). With the tire inflated you can still see a slit where the glass went through but there is no bulging and the tube does not appear to be pushing through the slit. Is this tire a good candidate for repair or must it be replaced?