A metal screwdriver might affect the inductance.  There are several inexpensive tuning tools made with a plastic handle and a small thin metal blade, for example:

https://www.digikey.com/product-detail/en/bourns-inc/H-90/H90-ND/262571

I used a similar tool when I built my K2.

Bob, N7XY

On 9/21/18 7:41 AM, AE0MM via Elecraft wrote:
The green plastic tuning tool is too wide to fit in the slot of the narrow slot 
slug-tuned inductors. Is it safe to use a screwdriver on the small slot 1µH 
inductors?

Thanks,
--mark/ae0mm
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