Proper screwdriver to use for the primary chain adjustment?

[PaulCDF]

Question:

For 1946 Chief;
What is the proper screwdriver or bit to use for the primary chain adjustment?

Most screw drivers I have will not fit within the Primary Chain Adjustment nut
OR are either too long or too short.

From what I have found seems to be "cabinet" type driver (no widening between
shaft and blade) with a four inch shaft.

If I was to chase down a Snap-On, or Mac Truck; or search Craftsman or Amazon
what would I ask for????

Best fit I have is a unmarked flat blade bit from an old basic "gun-smithing kit".
I'd prefer to have tools dedicated to the bike.

Or if anyone has a spare they would be willing to sell please send me a PM.

Thanks.

[Rubone]

Just get a regular screw driver and grind the sides flat....done.

[PaulCDF]

BRILLANT!
Thanks Wish I had thought of it!!!!