I have several different people telling me that a 8 pin tubular lock pick will open both 7 pin and 8 pin locks. Is that true? When i think about it, why would a company throw on a new lock with 1 extra pin if the same tool can still open it? Wouldn't the spacing between the pins be different on both the 7 and 8 pin, requiring you to buy both tools to open both locks? Thank you for your help.