Wanted to offer a recommendation, and thanks, to Mountain View Aviation. They manufacture the “Door Steward” aircraft door retractable cylinders. Well worth the view on their website. I had contacted them after my avionics shop lost the door clips which retain the cylinders, a small, but needed part. 2 days after an email request, they mailed 6 clips to my home address at NO CHARGE. Great product, great customer service. I have no other interest in this product other than a very satisfied customer.