Evening all - Does anyone have a good technique for accurately measuring the hole locations for the rear 4 lashing points? I need to drill 88 mm holes in 12 mm ply in the same locations as the lashing point below to insert the plastic trims. Any suggestions as to the best / easiest way of doing it? Thanks
I another thread on thsi forum someone mentioned grinding points onto bolts so that when you lay the plywood in position and press down they mark the hole location. Sounded like a good idea to me.
I just measured and marked the plywood where the holes should be, and then drilled small pilot holes to check and confirm.
Assuming you don’t have access to a rear Kombi mat that you can lay over the ply? A variation on @manfrotto suggestion would be, the captive nuts for the lashing points go right through the floor of the van so you could place the ply into the van and with the plastics under trays removed drill a reference hole up through them. The bolt holes for the lashing points are off centre but it would give you an accurate starting location to measure a centre point for the 88mm hole saw.
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yeah not got any flooring with holes for reference. Going from under seems the most accurate way but also a lot of work I guess
As @manfrotto says above I’d simply screw a stud into the lashing point hole and ensure it is ‘just’ proud of the ‘underside’ of your new ply floor. Lay your floor carefully into finished position. Lay a small block of wood or such like over the top of the location of the bolts and give a sharp blow with a mallet. You’ll end up with an indent in the ply underside exactly where you need to drill. 
@AshleyP hopefully you sorted yesterday. I'm in Bristol and have a template I made. Alternative use some thin ply, hardboard etc. and cut out oversixed holes in the location of the lashing point holes and then secure another piece of timber down, with double sided tape/Gorilla glue/superglue, then remove. I still made the holes oversized for a bit of tolerance.
Hi all. After a few arduous hours I managed to come up with a system using A4 paper, selotape as hinges off the bumper and walls, and a pencil to mark out the location of the bolt holes in the lashing points. I then transferred the marked paper to the ply floor that I just removed and rehinged the selotape to the ply, folded the paper over and, using the plastic disk covers with the single holes in them, lined up the hole with the marked point, drew around the circumference, and used my son's compass to locate the centre point. I then drilled with an 88 mm hole cutter at each of the 4 locations and put the ply floor back in. It was all very elaborate and time consuming but at the first attempt all the holes were surprisingly in the right place to receive the metal bed frame bolts. Job done.
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