Mike Horvath wrote:

> On 2/13/2015 8:59 PM, Alain wrote:
>>> I'm not sure I understand. Having holes of any kind would still 
produce
>>> blinking I think.
>>
>> The blinking effect can be reduced if the two openings set don't have
>> the same number of openings.
>>
>> Try 6 on the outer shell and 7 for the inner shell.
>>
>>
>> Alain
> 
> 
> That's an idea, and a pretty simple one too. Thanks.

Or you could make it as a "Dauerluft" (venting slot) with different 
number of slots.


-- 

Ger

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