Automatic grouting tool - GIF

[Toolmaker51]

I have one as well...driven by a Ryobi. Not being a mason, I call it unbeatable. I can get someone to use it while I attend joints on brick work. Seller was a traditional mason, just retiring. I willingly invest on interesting or useful tools for reasons like those, or anticipated future use. Found it as many of my odd treasures on list of that guy Craig.

As 'suther51' notes above [post #5], loaning out is risky.
I have a cornucopia of odd commercial tools. Only my friends know about them. Aware of what monetary value is placed on them to replace [not my acquisition cost] borrowing stipulates that agreement. Not rent, just security.
Persons who mistreat or damage others property, do so unaware of how much work had to be done to pay for said item.

Next day at 0530, this occurred to me.
Certain groups exist that despite need for such items; can't, don't, or won't work to acquire them. In that way, little separates them from burglars or thieves.