It's amazing that Robart has not fixed the problem with the holding blocks twisting causing the linkage barrel (part that the jackscrew threads thru) to pop out of the holding blocks. I had the same problem on a take-off on an asphalt runway at the Mint Julep in Kentucky meet last year. The motor then ran the entire flight until it burned out.

Down and Locked fixed the problem by machining a new part that combined the two holding blocks into one piece. Has worked perfect since. Now if they could just get an electric motor that is strong enough to operate the retracts without burning out or amping out before the gear cycle is complete.

There are several flyers in my club that have tried the Robart electric retracts on warbirds and all have gone (or are going back) to air retracts because of the problems with the motors and jackscrew. Down and Locks fix below: That is grease that looks like dirt.