All this stuff is new to me, but it seems there exists aluminum hydraulic cylinder stops that come in many different sizes that can be made to effectively shorten up on the cylinder stroke (say from a 25" max to 16+" firewood length) on a temporary basis. They are made of aluminum and would seem to ride with the ram so I would imagine scratching might be minimal, but I'm not sure. Are there any downsides to these things?
Here is a 4" spacer, for $19, no less:
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200324521_200324521
Here is a 4" spacer, for $19, no less:
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200324521_200324521