29 Notices. 26 Force Majeure. That is to say that we will not undertake the re-torquing of any fixings of the Powertrain Parts to the manufacturer"s specification. This shall not apply to WS Goods. 4.33 You shall provide us with a fully completed and signed proforma installation / site ready certificate ("Certificate" ) prior to the required installation date (which shall be at our sole discretion) where we are arranging the installation of WS Goods supplied to you.