portable straight key

A straight key that could be used for portable operation. I made 2 versions. One works without bearings and that works pretty smooth, with a little sanding the parts that fit together. The 2nd version needs 2 ball bearings 3x10x4. Those worked great for me: http://eu.banggood.com/Wholesale-Warehouse-10pcs-623-ZZ-3x10x4mm-Deep-Groove-Ball-Bearings-Miniature-Bearings-wp-Eu-81182.html
The lever is designed to have a 3.5mm gold contact bullet connectors fitted in that is used as 1 of the 2 contacts