Regarding the maintenance tip for the screw jack, here is a link to the "miracle" product that I have been using on all my landing gear with 100% success for 10 years in desert conditions:


http://www2.dupont.com/Consumer_Lubr...ain_saver.html


The product shall be used with the straw and sprayed 3 times: 1 time with the gear down, then retract the gear and re-spay with the gear up, then extend and spray one last time with the gear down.
This will basically flush all the dirt/ dust and replace it with a thin film of dry Teflon wax that is designed to shed all dust/ dirt off.

This product used to be called "teflon dry wax lubricant" and was in a blue spray can a couple of years ago.
We have a few cans at our shop in Huoston for those who would like to try the product.