knob for kk-1 straight key

Can the members of this group help me find a knob to add to my kk-1 straight key kit that I just assembled. I tried my local hardware store but all the drawer pull knobs they had seemed

Too large or too heavy. If somebody in the group has already solved this problem I would appreciate the part number and source.

Thank you all in advance for your help.

Tnx es 73

Brad N1VWD