How do I put the Vernier Dynamics System mass and the dual range force sensor on the dynamics cart at the same time?

The black thumbscrews shipped with many DFS-BTA units are just barely too long to allow Mass for Dynamics Cart, order code MASS, $12 to be attached to the cart at the same time as the force sensor.

See the photo below for the correct setup. To assemble this combination, attach the force sensor first, placing the DFS against the end of the cart. Use the larger accessory post as the attachment point. Tighten the thumbscrew. Then attach the mass, with the long axis across the cart. Use the short accessory rod with the long hex bolt.

If the thumbscrew is too long, you can either call us for a shorter screw, or just use a wirecutter to snip two threads off of the screw.

See also TIL 1452: How do I attach a mass to a Vernier dynamics cart?