That's pretty much all I know. If its firewood then just bore the tip in the trunk about 1/3 the length of the bar and cut down a couple inches so the caw will teeter in the slot.We've been doing like that for many years except I cut it off about waist high then sink the saw in the stump 1/2 -3/4 the depth of the bar, shut the saw off, put my hip sgainst it to hold and start fileling.
That's a clever vice tho.
saw this in Home Depot- blew my mind. http://www.homedepot.com/p/Light-n-Go-Bonfire-Jumbo-Log-506460/203374818Gonna make some out of ash lots of vids on youtube check them out
Swedish fire torch.
Cool see looks fun don't it lol