A tool that helps when you want to prepare the skid of a (sports) sledge.

I guess the pictures do answer most of the questions.

I used M5 screws and  thread insert.

Printed in PLA. 15% infill.

The original is done in FreeCad and I've put most of the parameters in a parameter spreadsheet for easy adaptation. 
 

Actually the version became a little bit to big, but that does not matter too much.