When placing a Micro Camalot of size .3 and above, retracting it fully or up to 25% can usually provide a solid placement, assuming the rock is good and not too slick or flared. However, for the smaller .1 and .2 Camalots, they may lose their ability to hold a fall when retracted more than 40%. It's important to note that proper placement technique and assessing the rock quality are crucial in determining the reliability of any cam placement.