In draftsight to set tolerances to perhaps, 1/32, use UNITSYSTEM.

Thanks Cheryl for Lena reminders....

Cheryl thanks for reminding about Satellite!
https://www.youtube.com/watch?v=8QSgNM9yNjo#t=53

and Lena Eurovision Songkontest

https://www.youtube.com/watch?v=IRgp-7Q4alU

and this....
on Ina's Night....the best....

https://www.youtube.com/watch?v=Sk7WsWhgQxY

Lenka

https://www.youtube.com/watch?v=sB2MBop0cLohttps

://www.youtube.com/watch?v=QHpvlr_kG6U

Lena

https://www.youtube.com/watch?v=pt5F7XTUR50

LINK FOR COLUMBUS STEEL

http://www.columbussteel.com/locomotive_couplers.html