I was getting sketched out tightening and loosening the bolts on my 12V 100Ah Amazon batteries with an uninsulated box end wrench. I have some that are M8 bolts and use a 13mm wrench and some that are 5/16" bolts and use a 1/2" wrench. But thankfully those sizes are so close that a 1/2" wrench works for the M8 bolts perfectly. In my area thrift shops have drawers of loose single wrenches for under $1 each.
So I took an angle grinder and zipped off one end and put 2 layers of heat shrink over the handle. Easy and almost free.
So I took an angle grinder and zipped off one end and put 2 layers of heat shrink over the handle. Easy and almost free.