Drill it.
Mount it.
and thank your uncle.
I'm always leery about making non-reversible modifications to stuff too. But to get full value out of a vise, it needs to be bolted to the bench. And fasten the bench to the floor, wall or both.
it's a work bench...use it as such.
You could make a receiver and bolt it in from the bottom (open area). If you want the bolt head flush with the top, counter bore with a correct sized spade bit. This way you could remove the vise when not needed and utilize the receiver for other jigs.

Now that is positively BRILLIANT. 


Drill it.
Mount it.
and thank your uncle.
MM: that is a nice little Fuller vise and probably a good size for your bench. it's a light to medium duty vise so won't have that much action and bolts should be fine. if you have a piece of plate you can mount it like this member did on his nice wood top bench. or the receiver method is another way to do so you can remove it and have it out of the way when you are not using it.
lots of ideas here on this thread.
http://www.garagejournal.com/forum/showthread.php?t=252799&highlight=vise+stands
It is a work bench....use it as such. Drill it and mount the vise. Or is your bench just for looks and you will dust it every week with a Swifter and never use it, except for looks. And be careful for water rings.....might want to use several coats of high gloss polyurethane on the top.
It all depends on what type of work he is doing on the bench.
His bench looks very clean and neat, so either its brand new, or he does not use it that hard......yet.....
If the bench is used for light duty things, like polishing parts, taking apart and putting back together things like electronic stuff, home items and hobby use, then it will stay clean looking, and he may not need to permanently attach the vise.
If the bench is going to be used to weld stuff, work on dirty greasy car parts, and generally used hard, then it will become dirty in no time, and then I can agree with your "it's a work bench" statement, and he should bolt the vise down permanently.
Some people have multiple benches to work on. One that they try to keep nice for doing "clean" work and one that they don't care what happens to it for doing 'dirty" work.
I am one of those people. The work bench in my garage is my 'Dirty" bench. It gets burn marks from welding stuff. It gets extremely dirty working on greasy car parts. It has pieces missing from the top surface from where pry bars have slipped and taken out pieces of it. It has some type of paint splotch from just about everything I have ever painted on it. It is a hard work bench.
In my basement however I have my "Clean" bench. I use that one for working on electronics, doing wood working, making pens, and other light duty things where I want a clean work surface.
To just say its a work bench, do it, is not really the responses he is looking for. It's what he intends to use the bench for the most that will determine if he NEEDS to attach the vise permanently or not.
Jim
If you are at all leery about it, don't do it. I would think about finding another place for that vise as mentioned, like a stand or something.
Tools are meant to be used not preserved in pristine condition. Drill some holes in the bench, bolt that sucker down and get to work. Enjoy using your tools.
-Valentine
If you don't want to drill the bench, mount the vise to a board or piece of plywood you can clamp down when you need it, this will be ok for light work.
I'm always leery about making non-reversible modifications to stuff too. But to get full value out of a vise, it needs to be bolted to the bench. And fasten the bench to the floor, wall or both.
Sometimes fear of making the wrong decision holds us back. How about mounting it to a steel plate as has been suggested, so you can start using it. If you find that you are leaving it in place, not removing it from its temporary mounting, then mount it permanently, later.
First you have to decide whether you want a workbench or a piece of furniture.... If it's a bench, get out the drill; if it's furniture get out the Lemon Pledge.

Your space is tight with regard to clamping anything very long, after vise installation at one end of the bench.
I'd consider the truck rim pedestal....many examples in the Vises thread!
