Anyone have plans/patterns/pictures of an adjustable "chunk"?

[Roger B]

I'm getting interested in "chunk" & table shooting. I have my dad's old light bench gun which only requires removal of the receiver Redfields & addition of iron sights to be legal, but I want an adjustable chunk. As above, anyone have plans or pictures I might use to make one? Many thanks,
Roger B.

[okieboy]

  Here you go.

[Daryl]

Adjustable Chunk.
Taylor and I made a bunch of these up and used them as prized in a chunk shoot at BC Rendezvous some years ago.
The read-rod goes all the way through, side to side and the large wing nuts of both sides make it easily & quickly adjustable.
We used maple 1" x 4" kiln dried boards.
IIRC, the cross piece was 2x3" hemlock but it could have been pine.

[MuskratMike]

Google "Alvin York Shoot". You will find their web page. Lots of photos of different ones there. It is I believe the largest chunk shoot in the nation.

[Roger B]

Thanks, guys! 
Roger B.