Hello I believe it is 1/4 in hex its at the end of the electric pump motor. The drill drives/ spins the eletric motor/pump so that you can move the slides. You will see the decal on the end of the motor showing you the place for the hex and size remove the deal insert the hex and drive. Hope this helps.
__________________
Mike and Nancy
Wildcat 5er 2007 28rks
1999 ford f250 SD(retired)
2010 Dodge 6.7L ctd
Connecticut
|