Although going back to the drawing board may be frustrating at times, it  definitely has both its pros and cons. One of the main cons when it  comes to this is a setback in production, this is because now you  basically have to start fresh with certain parts that are being made, if  the part failed, if it did not work due to size, etc. You may have to  go back to the drawing board for many reasons. With that being said  going back to the drawing board is not always a bad thing, sometimes it  leads to more efficient ways of manufacturing something, it obviously is  making the part better than it originally was, hence this is why you go  back to the drawing board, and most of all, the refresh of going over  what has been done may help you realize where else there may be a mess  up in this engineered piece, which may help you look over those things  to see if, in fact, they will fail as well. An example of going back to  the drawing board will be from personal experience, as I myself like to  fabricate things, I custom fabricated the suspension on my vehicle, the  first set of A-Arms I created for my truck where long travel, the arms  were perfectly fine and I had no issues what so ever, the problem I had  was this design was supposed to make my vehicle smoother when  off-roading, but in fact, this made my ride worse than it was with stock  suspension components. I decided to go back to the drawing board and  brainstorm what could have possibly gone wrong because the material was  strong and sturdy and it did not fail, I thought really hard and started  to do research on vehicles with this type of suspension and try to see  what my custom piece has different from manufactured pieces. After I  examined my piece and I came to a realization, I was using the original  Shock for suspension which for one has less shock absorption than I  needed, and secondly, the shock was mounted basically in a factory  position almost making it vertical, when it needed to be angled  slightly. My fix to this was moving the shock mount on the A-arms  slightly over to give the shock an angle when mounted as well as adding a  bigger shock with more travel, after these modifications, my vehicle  suspension was a success and it rode way smoother than expected! After  this I really looked into my suspension again and realized I may have  over-engineered it with too much material, it was very sturdy but very  heavy for the vehicle, so I then made the suspension with a mixture of  both .125" thick steel and 1/4" thick steel making the A-arms both  lighter than the original design by about 15Lbs and lighter than the  stock suspension by 25Lbs.