lol.. you should try the stock cable too... its quite a huge diff as compared to the recabled ones

ouch.. a dent.. you can try using a needle (use the blunt end) and put some glue tack (roll into a tiny ball) to stick to the end of the needle......stick and pull out the dented part (be gentle tho)

but since bro PCwork is willing to help you fix, better let a pro handle then having more damage being dealt

the cable is super durable.. trust me .. ive tried pulling the cable off my friend's broken recabled ksc75 (his coil burnt.. no way to save.. so i tried to take the cable out to use for recabling another pair) and guess what.. the coil and the PCB got pulled out as well XD

braiding the cables... cleaning off the old solders from the koss... twisting the cables to fit into the koss then carefully solder them to the drivers ... its a delicate and time consuming process mang so do try to be patient