Here is step by step ML-L3 Nikon remote controller modification for wired operation. Normal ML-L3 functions remains, but extended cord is added in order to trigger D70 by remote switch. Switch used here is Manfrotto optional electronic shutter release switch 322RS produced for the Action grip ball head 322RC2: http://www.manfrotto.com/product/templates/templates.php3?sectionid=8&itemid=2013.
All the details are described within every picture.
Please check for complexity of this mod and if your skills are not up to this operation, please quit the whole idea. You are definitely voiding your warranty with this modification and certainly can damage and destroy your remote controller.
I can not take any responsibility concerning the damage and losses. You have being warned!