I've just lost the driver's side one. I lifted the Tenax button and as I started to pull, it suddenly went. It had sheared across the screw thread. Heart sank. The break is a mm deep into the wood and not a flat face for drilling into. I guess it's possible it could already have been weakened by inappropriate use prior to my ownership. However, when I look at the section that was still in the tenax, it doesn't look to be a solid screw where it has sheared. There appears to be a type of pink filler inside it. That seems dodgy.

I spoke to Krazy Horse about it when I rang this week to book a service. They seem used to it and said it's usually a quick job. Have asked Krazy Horse to fit a replacement, during the service later this month. Under 1 year old car, will this be a warranty fix? I've taped the area over, in case the tenax on the hood flaps against the bodywork.

I've owned a few soft-tops with tenax fasteners over the years. This is the first time I've ever had a tennax fail.
Either a poor quality fastener is being used; or
The way they screw into wood, through an oversize hole the aluminium panel, doesn't support the base of the male part of the tenax sufficiently, adding leverage to lateral forces, and maybe promoting fatigue; or
The hood tensions are much greater on these and the standard tenax may not be strong enough?

I'll try another standard tenax. If that fails, the two screw Woolies option linked above, looks a better solution. Especially if aligned with the force applied by the hood. I guess the risk then is the tenax holding firm, but damaging the body panel. Hopefully the amount of force required for that, would be greater than that needed to remind me I've forgotten to release the fastener.

Plus Six
'75 Commando 850
'76 CB750K6