Sanding sticks. The way I build models there is always a need for them. Second would be surgical hemostats for gripping small parts for positioning on the model. I have several sets of them, from small needle tip to wide duckbill. I couldn't survive with out them.
Berny
Phormer Phantom Phixer
On the bench
TF-102A Delta Dagger, 32nd FIS, 54-1370, 1/48 scale. Monogram Pro Modeler with C&H conversion.
Revell F-4E Phantom II 33rd TFW, 58th TFS, 69-260, 1/32 scale.
Tamiya F-4D Phantom II, 13th TFS, 66-8711, 1/32 scale. F-4 Phantom Group Build.