HI I was wondering is there any difference between a 2007 Rotex 150 FEQ and a 2018 Rotex 150 FEQ as I just bought a 2007 one on ebay and it's brand new never been used but I noticed that on the sanding base it doesn't have all the holes that the new one has it only has holes on the outside so was there a difference in the years or is it just the sanding base is an older model??