The answer to post #15 is an 'if' answer.
IF:
- the engine idles ok & the mixture screws [ either screwing in or out ] have control of idle quality
- & if there is no off idle flat spot & smooth transition from idle to main cct.
- then there is no problem with the t-slot closed off by the t/blades.
It is actually a benefit in my opinion because more of the t-slot is available for the very sensitive off idle metering & transition to the main cct.