Go online and/or call the Winchester Parts Dept and look up the part # for the Breech Bolt Slide Link assembly for your SX3. Link....That is the little swinging arm plunger looking gizmo that has to be positioned properly on reassembly to drop down into the action tube. It pushes the action spring back, inside the action tube, upon recoil and the spring closes the action back with the new shell ready for firing. I have an SX2, but I'm sure the parts are the same. Your part #40 for that part, the " link " is B1116129AJ. I think you can just replace that part # without replacing the whole assembly. The link is 18.75 and the whole assembly is 218.00. You may have to replace the link pin that holds the link to the slide. It's 5.00. I'll see if I have a URL address for the parts schematic for the SX3. It puzzles me how you bent that part. Either the link wasn't set down in the tube properly at cleaning or it came out if the operating handle plunger came out and then was reinserted allowing the link to come out of the action tube.
Now if the link
isn't the thing that bent and the Action Tube
is what was bent, then it's obvious that when you cleaned it, you failed to drop the link back down in the tube and the shot you fired bent the tube. The Action Tube (#5) is either 21.00 or 30.00 acording to whether or not your gun is composite or field (two different part #'s). (2008 prices)
You can call them at 800 322-4626 and explain the problem with the above terminology.
pages 7, 8, & 9 (schematic diagram)http://media.winchesterguns.com/pdf/parts/2008_winchester_parts_pricelist.pdf
Just be aware, that when you are reassembling the SX3's bolt assembly, you must stand the gun up, near vertical, and have good light to be able to see down behind the bolt so as to dangle the link above the action tube & allow the link to slip in.