There is actually a steel plate with the proper shape and size receptacles
for the jump seat "feet."  That plate should have been a part of your jump
seat purchase.  I got mine, iirc, from Ken Wilford.  He was very helpful,
and supplied me with a diagram and step by step installation instructions.
The purchase also included the seat belt for the seat.  Without all the
correct bits, the chair's safety in a crash is severely compromised.  And
yes, the plate must be welded in place iirc.

mcneely

On Fri, Jul 20, 2018 at 8:07 AM, Dan Lamb <vanagongramps@gmail.com> wrote:

> Might look into rivet nuts (“rivnuts ). Look on YouTube for vids and how
> to install without expensive tools. Basically drill a hole, install hollow
> rivet that has internal threads, pull it up to rivet to underside of metal,
> remove install device (homemade-easy) and bolt down seat bracket😁. Good
> luck.
>
> Dan
> Country Homes Camper, the Huckleberry Sky
>
> > On Jul 20, 2018, at 7:40 AM, Andrew Berg <andrew@BERGWEB.CA> wrote:
> >
> > I'm in the process of installing a rear facing jump seat. I have the
> bracket mounted up to the battery box and now need to get the floor
> supports in. I've seen some people just drill small holes in the plywood
> subfloor to expose the metal floor beneath and then JB weld 1/2" or 5/8"
> nuts in place. I tried this and even after a 24 hour cure, they pop out as
> the jump seat is tilted forward to remove it from the van. I think I need
> to actually weld these to the floor. Doing so would require removal of the
> entire plywood subfloor. I already have the rear bench out of the van, but
> I think a row of screws is holding the plywood slightly below the front
> edge of the cabinetry. Do I need to fully remove the cabinets, fridge,
> sink, etc. to get at these screws and remove the plywood subfloor or is
> there an easier way. I was thinking of even using a circular saw and
> cutting out a portion of the subfloor to expose enough area to safely
> complete the welds and then screw it back in place afterwards. Ideally, I
> would pull the whole floor up and then put down some laminate or something
> nicer later, but it seems like a big job.
> >
> > Andrew
>