According to British Car Specialist's Tech Talk book, you should have 7 rows
front to back of 4 holes spaced 1 1/2" off the longitudinal center line and 2
1/2" apart from each other front to back and left to right.? The two rear holes
should only be 1/2" deep and the rest only 1" deep.? This is done with a 1 3/4"
hole saw with the center drill bit removed.? Not sure if this will make any
difference with the size hole you have in your wood frame or not. I don't know
how big or how deep you made the holes.? Sounds like you need new foam, drill
the holes again then you need to install some webbing over the hole for some
support of the foam.Mike MacLean?
On Wednesday, January 11, 2017 4:07 PM, Austin Healeys List <austinhealeyslist
at gmail.com> wrote:
A few years back I fixed up the BN4 seat bases with repro polyurethane
foam inserts and after only 2000 miles they are disintegrating because
the 'D' hole in the reproduction wood frame is too big and offers no
support to the foam in the middle of the seat. As a result the foam
has split around the edges of the D and the centre section that is
unsupported is breaking free from the rest. The foam was originally so
firm it was uncomfortable so I did the holesaw trick to reduce its
stiffness but this appears to have contributed to the disintegration.
Is this a common issue? What are others doing?
Attached are a couple of pics, one from an unrestored BN4 showing a
much smaller D hole, the other is of the repro part. I'm thinking of
remaking the base with the smaller D hole to try and stop the
prolapse.
Andy.
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