Their unique Kubera yantra archanai happens on Thursdays and has been very elusive for us. Even today we are unable to go for it. The Kuberan Yantra was apparently present on the building site when the temple was constructed in 1921, and identified as such by Kanchi Periyavar (or someone allied). A fitting presence for a community of merchants, many in the precious metals and fabrics trade! An Abhishekam to the Yantra happens monthly once on Poosa nakshatram. Archanais are a weekly affair.