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MG MGB Technical - Seat diaphragm

I am restoring a 1966 roadster. When trying to install the rubber diaphragm from Moss I warmed it as an archives posting noted, but when I stretched it the first hook it tore the rubber right out. Can I use the webbing listed for the 1970 -1980 ? Does this hook in any easier? Thanks for your help.
D Enghauser

D. Yes, the two systems interchange. Both the diaphragm and the webbing will fit either seat. I have installed three sets if webbing and one diaphragm set over the last two years, none with any problems noted. Sounds like you got an old set and it should be returned to the retailer. Installed a diaphragm two months ago and no problems noted.

Les
Les Bengtson

The diaphragm should have a bar moulded into the rubber running round the edge and through the hooks, sounds like yours doesn't have that if it pulled right through.

I think installing webbing is probably easier as you are only pulling on one relatively narrow section at a time, compared to the diaphragm. Having done this 2 or 3 times now I've found the easiest way is to thread a length of strong wire or cord through the hook with both ends tied round a bar gripped in your hands. Then brace your feet against the upside-down frame and pull on the bar to drag the tip of the hook over the hole in the frame, and it should drop right in.
Paul Hunt 2

We never install the webbing, even in cars that originally had it (unless the owner requests it). The rubber lasts longer and is more supportive.

It sounds to me like you had an old or cheap reproduction set since they shouldn't tear like that.
Alan Dalman

I replaced the diaphragms in both seats (replacements were Moss from some time ago). I used a hair dryer to really heat the rubber while stretching with no problem. These things are usually quite tough as they are stretched all the time.

My guess is it was from a marginal supplier or defective. They hold up for many years.
Robert McCoy

I just used violence on mine. Always worth taking a picture as this shows I did it indoors so the diaphragms were not too cold. I think I made some hooks up from heavy fencing wire and used either mole grips or pliers on the the other end. I may have put this in one hole and used it to heave things to about the right place and then engaged the correct fitting in the hole next to it. It seemed impossible to begin with By the time I finished I could do them in seconds with a flick of the wrist.

Stan Best

D,

Sounds like the typical cr*p Moss parts we are used to over here. Used webbing myself no problem......that is after I returned it to Moss as it was missing hooks, along with the poor quality/ancient foam bases they sent me, and got decent ones from the MGB Hive.
Clark

This thread was discussed between 15/09/2007 and 25/09/2007

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