==========roll cage, please follow the following to the "t":The tubing must be 44.45mm dia x 2.6mm thickness for main hoops and forward legs, and 38.1mm dia x 2.6mm thickness for all other members. The tubing material is low carbon, cold drawn seamless or cold drawn welded tube which is normalized to provide yield strengths of between 400-500 MPa=====================Gowtham Santhakumar from Pollachi, TN has developed a cable operated selectable diff lock for 19 & 30 spline Dana 44. Best to contact him on 9976631118. Price is about 31.5K. He is offering one year warranty. I assume 30 Spline Differential Lock is Suitable for TharHas it got a cast iron solid diff cover Is all the components locally manufacturedActuating Cable is from a Maruti Omni Clutch CableThe Default position is OPEN,; if the Cable Snaps, then the Differential Lock, will unlock and function as an open DifferentialThe Lambda Differential Lock is a Carrier Replacement, the entire carrier assembly and spider gears are replaced. The Crown Gear is bolted on to the new Carrier(Diff-Lock) and Differential Ratios from 3.92 to 5.89 can be used.The Actuating Shaft does not have detentsRusting - If the vehicle is in regular use, then rusting will be negligible.Freezing - If differential Oils Freeze, then the Locker will Freeze.If the Actuating Cable can Freeze, then the Diff-Lock may not be engaged/dis-engaged.The Force required to engage, similar to getting off an armchair, using your hands.How ever dis-engaging the locker takes a bit more effort, but it is not uncomfortable.Always fit a rear diff lock first3) Lambda manufactures all parts or some are bought out. Imported or otherwise. 3) The modified diff cover: Supplied by Lambda, or modified at users end? 4) Selector fork: actuating shaft has positive detents? 5) Selector fork: Apart from water resistance, what are the chances of it rusting and freezing? 6) What is the force necessary to engage? While running engaged, how hot will the fork get? 7) Showcased/ trialed in any OTR? ==============case fileMedical reportsMedicine used ( as mentione in bills)Original receipt, pathological and other test reports from a pathologist / radiologist including film etc supported by the note from attending medical practitioner / surgeon demanding such tests.