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I got a quote from an auto upholstery shop in the midwest for under $200.00 including placing all fasteners on the car and in the tonneau itself. First thing they did was check to see if they could drill up from under the dash on my VS and seem to think it wouldn't be a problem. The fasteners to the rear of the doors and around the back for the quarter tonneau were already in place. This was a couple years ago and I didn't follow up because we were moving.

Also check with marine canvas or sail makers if you are near water.

Depending on the FG thickness in the area of the Tenex install you can drill the necessary hole/s by hand using a good drill bit with your fingers. I know because I did this on my Spyder and did 3  that way not an easy task but doable with time and care.

Due to all gauges etc going from under and getting it in the right place is very hard IMHO, easier if you can start the hole with you fingers have a bright light on top then when looking from underneath you can see the start hole though the FG then drill it if you have the room with a small drill.

Pete

Drclock's Tip of The Day...I've installed the tonneau dash snaps with the windshield in place from under the dash The first two times I did a lot of measuring and tossed in some luck drilled from under the dash . Since then, I found a much easier way by making a simple tool fitting a drill bit to a small socket using JB weld & used a 1'4" drive ratchet patiently drilled the 4 dash holes from the top side .

Last edited by Alan Merklin

I drilled both of the holes for the snaps near the windshield center strut from below.  

Just measure where you want them to be (both of mine are about 2" from the center strut rod and just on either side) and then re-measure from below, put a dot on the underside of the cowl with a Sharpie and then slowly drill the hole - I had plenty of room under there to get at it.  Safety glasses and/or a vacuum hose near the bit is a good idea.  Once the holes are in, I installed the snap ends using a 90 degree offset screwdriver - one of those you always get with a pre-sorted tool set but never know what to do with.

IIRC, I also have another snap on the edge of the cowl, an inch or so forward of the top of the door.  None down the length of the door, and the next one to the rear is the first of the top snaps on the side of the cockpit.

I've never driven with the tonneau on more than the back quarter.  Never thought I needed it nor did I want to damage the paint on top of the doors.  Like Alan, I also have a clear 3M film along the tops of the doors, but mostly to avoid abrasion from the side window gaskets, when in.

@Alan Merklin, @Bill Prout@Gordon Nichols, and the rest of you all...

Why are two snaps necessary on the dash? Isn't the passenger side snap sufficient?

When you drive, it's unzipped, and when you park, the zipper holds it up front next to the single peg. Right? Why two pegs?

@Sacto Mitch was kind enough to send a few photos. What say the experts here?

Mitch's Dash

 

Last edited by Ryan (formerly) in NorCal

My last IM had two pegs just under the mirror, where the zipper closes up - one for the driver side of the tonneau, and one for the passenger side.  If I remember correctly, every sports car I have ever had that used a tonneau had two pegs in that location.

I would not rely on the zipper to hold the driver's side closed tight enough when the car is parked outside.

You also need a snap at each end of the dash, just inside where the windshield pillar joins the dash, plus one at the leading top edge of each door.  Plus all the other snaps needed, of course.

Last edited by Bob: IM S6

I'd say go with four across the dash; not because that's how it's always been done but that's what works. And it just looks right. If you just use three the post on the dash will be to the right of the mirror rod. And if you don't have one to the left of the mirror rod the balance will be off and it will disrupt the visual appeal of the whole car. Mind you, it's a delicate balance. 

I travel with the passenger half buttoned up all the time -- except of course if there IS a passenger.  That half is held by two snaps, one next to mirror, the other at the door corner, and this is UNSAT as far as I am concerned.  The toneau flaps around way too much at speed.  I figure I need two more snaps in between, and I have conscripted the Good Dr. Clock to show me how.  I have heard a right angle drill driver is needed, but see above, where Alan has a better idea all figured.  An hour and half ride up to Chambersburg is worth it to me -- if we can ever get our schedules figured out.

I have 3 Tenax on the right and two on the left. My Tonneau originally also had a couple of flat plastic bits on the right that allowed me to tuck them under the door tops from the outside. The plastic bits helped more with the flapping, but, alas, they broke off.

I drive around town mostly with the right closed off. At highway speed it's too much flapping.

I rarely am on the highway with the top down. Usually, I'm on the highway in and out of storage and to and from Carlisle and sometimes across town to see Buckwheat in Grosse Pointe with the top up.

At one point, I toyed with the idea of sewing in long pockets on the underside for sail battens, but dropped the idea.
>

On my CMC the top piece on the door with the side curtain sockets laps over the top of the door so it holds the tonneau up about 3/16" above what would be paint (mine is gel coat).

I have a Tenax by the windshield post and another behind the door. I too have felt the need for some intermediate fasteners.

I cut some short pieces of tubing and I am going to epoxy a Tenax post into the ends.

Then I can drop these into the sockets to provide fastening locations without putting fasteners in the door itself.

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