My pleasure, gentlemen. I'll be happy to help with anything I can. I'm always spotting things on various Vietnam M113 models on-line that drive me nuts. I'll mention two of my pet peeves, here:
1. Remove the rubber track shrouds! They were about the first item discarded in-country by most American mech and cav units. They hindered preventive maintenance and complicated replacing a thrown track - which happened a lot when you were jungle-busting - breaking trail through the woods using your track as a bull-dozer.
An aside here: An M113 veteran almost, at least during my service, never called his vehicle by that official nomenclature in everyday conversation. Nor did he call it an APC, Armored Personnel Carrier, "Gavin". Some of the Cav guys called them ACAV's, once in a while. But we all simply called them "tracks". I know this can cause confusion, especially when we are talking about the tracks (caterpillar treads)of our tracks (vehicles). We "Delta" types were "track drivers" who had to attend to track tension, lest our tracks depart the track! Everybody clear about that? Clear as paddy water, at least?
That brings me to my next gripe:
2. Pay close attention to the track tension on your model. This is a critical issue on the full-scale M113. Too much and you bend or break track pins and eventually break the track. Too little and you will throw a track off the road wheels with the slightest nudge on the side, usually while turning on rough terrain.
Here is an examples of a correctly adjusted track...
https://flic.kr/p/dvcJWGThe top of the track follows a smooth catenary curve from the sprocket to the third road-wheel. It NEVER touches the first road-wheel, comes close or just kisses the second, and makes solid contact with the remaining three wheels.
Here's a shot of a track that is too tight:
https://www.flickr.com/photos/zippo132/6904645765/in/photostream/The top of the track is nearly a straight line from the sprocket to the idler wheel. Having said that, this one appears to be underway, and track tension must be checked at rest on a level surface to be accurate. Under hard acceleration that top curve might straighten a bit, but the relaxed gunner sitting on the edge of his armor tub says otherwise.
Here is a track that is too loose...
https://upload.wikimedia.org/wikipedia/commons/f/f2/M113-batey-haosef-2.jpgIt's difficult to find a shot of this in the field, perhaps because it's so easy to throw a track this way. Once you have done this, and gone through all the blood, sweat, and tears of getting it back on, it tends to drive the lesson home. So I have resorted to this museum shot. It needs no further explanation.
The track tension, in case you did not know, is adjusted by using a grease gun to pump up a cylinder attached to the idler wheel.
Finally...
https://flic.kr/p/dxJg9yTrack Drivers spent a lot of time doing PM, especially on their tracks, if they knew what was good for them and their buddies. Check out the maintenance supervisor looking down from the driver's hatch.
Hope this helps. I welcome questions.
Panther Charlie One-Four Delta, out.