Planned ahead just in case! Did research and figured we need the Run Capacitor because there was a clicking sound that had been happening for a while when the compressor was trying to kick in, temp inside set off freezer alarm when it went over 22 degree. Glad we bought the Tsd also (for just in case) because the capacitor (cheapest part $26.74 that should have fixed issue) was remade a bit bigger than original part and would not snap together properly and the ONLY way to make the capacitor fit was to use the Tsd ($67.70) which has the original size sets on the plug in side to the compressor to make them snap together and plug in proper, it took us a few extra minutes because we debated on opening the Tsd because didn't want to open a part and waste money that may not be needed, but it definitely was needed to make it all snap together and all is working GREAT!