Extra parts for Motorized Marble Machine.

These are a couple parts to help improve the motorized marble machine.
1. Motor block - This is in case you don't have a tiny grub screw for the small gear, this will give clearance. Also to stop the need for butting the small gear right up against the motor block.
2. Spiral catch - This is for neatening up the bottom of the spiral - a nice finishing touch :)