there you go .....
Never bothered fitting the lower two. 45K in 20 years, never had a problem (or dirty knees).
Cowering in a dark corner waiting for some clever dick to come along to correct or criticise my spelling and grammar
Maybe that's the simple answer for me then. It would be nice not to have to hurriedly throw myself onto the ground, squinting into the darkness trying to locate the bottom screws so I can check my oil level.
DZUS fasteners were the go to for most aircraft manufacturers up until about the early sixties when more efficient QR fasteners came into being.
The wire was as usual fixed with pop rivets which with usage loosened off & elongated the holes they were in.
Replacement of the rivets usually entailed going oversize until a patch repair was required to revert back to the original rivet diameter.
With airframe vibration the fastener body if a loose lock used to enlarge the hole so not surprisingly when removing a panel they used to end up on the ground fully detached. Again another patch repair to revert the hole to standard size. Or one secretly refitted it for the next victim.......
The security of panels could become rather tenuous to say the least!!
If a 'liney' one carried a DZUS tool which had two different sized ends to cope with most panel fasteners. One stored it on a piece of string around the neck.
A certain person on here used to do the Ti grills and when he made them you used to get as a freebee with the grill, a Ti bottle opener with a end to undo the DZUS at the other end. Two very essential tools in one ! It also fitted on a key ring.
Those bottle openers are great. They look too thin to be any use, but being Ti, of course work fine
I've just drilled out the old fasteners and installed these. Thanks Roger for the link. This is going to save me scrabbling around on my back every time I need to check the dry sump tank level. I was a little nervous riveting into glass fibre but I used some washers to spread the load a bit. It seemed to work fine.