Need help with remotoring the smaller Mantua old vintage 0-4- 0and 0-6-0 engines Anyone have experience with the 754 kit from Dan's Yardbird shop? Seems the bolts loosen with time and just unthread themselves.... Also NWSL remotoring requires lots of filing and still having issues with the drive mechanism not running smoothly- surely does not coast down the track...what can i do to make these little old engines really realistic and smooth? I really love them and spend a lot of time upgrading them . Any fotos of how to do things would really help. Thanks for helping out a new guy. PS I love Sergent couplers - how come they are not advertised very much- they are realistic and work fine though not automatically .