Here are the instructions Conetrol sent me:
=====H&KDT=====
SUPPLEMENTARY INSTRUCTIONS for enclosed base
(supersedes "Attaching the Base" section of regular instruction sheet):
Important! -- Before proceeding with mounting of this Conetrol base, be
sure the attachment screws are not too long. Hold the base on top of the
receiver with the screws in place and entered in the square holes on the
gun. Neither screw should be long enough to make contact at bottom. If
contact is noted, shorten the screw just enough to prevent this.
1. Insert cone-shaped locknut, with sloped side up, into each square hole
in top of receiver.
2. Temporarily insert screw to maneuver each locknut inside holes until
the flat edges of both are turned against front of square holes.
3. Put base in place on gun receiver so that its screw holes are aligned
with threaded holes in locknuts below. Insert screws provided and turn
them into the locknuts, taking care to see that the flat edges of the
locknuts remain forward in holes.
4. Keeping base pushed forward hard, as though you were trying to slide it
toward barrel muzzle, tighten each screw firmly.
5. Proceed to "Mounting the Scope" section of basic instruction sheet.
