Wanesco Selective Soldering Station

I am looking for someone using Wanesco Soldering Station with hole blow-off option installed.I am trying to set it up using hot air. It is provided with special tips with rubber lining to seal off the slected area. But it leaves few holes always blocked. Currently, I am trying to design custom tips to blow off all holes at same time. It is not going to be economical solution. Anybody there to share the experience?

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