Cuppung a harp with side vents

Hello David,

In the cupping section you talk about cupping the right side vent of the harmonica.

I am still fighting with it but what I have bigger troubles with is the left side vent.

In order for me to have the playing surface of the upper plate available to me I cant help but expose this vent, so I have been wondering.

Is scotch tape a possibility? :)

Or should I look for another approach?

Thanks in advance!

Angel