Please How do I call  BuyingPowerModel = SecurityMarginModel(3.3) in a universe selection model like this

        def Initc(self):
        self.UniverseSettings.Resolution = Resolution.Daily
        self.symDataDict = { }
        #self.UniverseTickers = ["BTCUSDT"]
        self.UniverseTickers = ["SOLUSDT", "BNBUSDT", "ADAUSDT", "BTCUSDT"]
        universeSymbols = []
        for symbol in self.UniverseTickers:

            universeSymbols.append(Symbol.Create(symbol, SecurityType.Crypto, Market.Binance))
            
        self.SetUniverseSelection(ManualUniverseSelectionModel(universeSymbols))
        
        Symbl.BuyingPowerModel = SecurityMarginModel(3.3) ??