Hi.
Ron Ferrel posted images of prototype and Kadee 118 tightlock couplers at:
COUPLER HELP GROUP
formatting link
For more details with methods and extensive discussion of problems and solutions, see first site below in couplers.
Hope this helps.
Thank you,
Budb
Author of:
MODELRAILROAD TECHNICAL INFORMATION
formatting link
PROTOTYPE TECHNICAL INFO FOR MODELRAILROADERS (Revised. New address)
formatting link
Moderator of: MR TECHNICAL HELP GROUP
formatting link
HELP GROUP
formatting link