Replacement Casters for SWR RedHead Combo

Hi Guys, I have run into an issue with my later model (post '08) SWR Red Head combo that has proven to be a challenge to resolve. At some point over the last few months "1" of the casters on the combo suffered some damage to the point where the last time I had it out live the caster just fell off when the combo was picked up to load in. The 'receptacle' (for lack of a better word at the moment) appears to be displaced form it's place on the bottom of the amp. It recently worked it's way completely out of the enclosure a few days ago and is currently lying on the floor in my studio. I researched several mgr's and have had no luck finding a repair/replacement option. Has anyone here had this issue? Are there any suggestions? Also, can the original casters be 'upgraded' to something more sturdy/durable (like possibly casters with larger pneumatic wheels/tires)? The wheels on the original casters are a hard plastic and have begun to show signs of wear like chips around the edges.
Any help would be greatly appreciated.
 
I got a set of Penn Elco casters from Parts Express not too long ago that seemed like an "OEM" replacement for a Goliath IV cab. Probably a good place to start. The set was about $20.
 
Plate castors, each rated for something like the full weight of the cab x 2. Then it can handle 2 G's on a corner drop or 4 G's on an end, like when going off a curb. Pneumatic only if you need isolation or frequently go off-road with it. McMaster is not the cheapest, but they have everything. Grainger you may find locally. Most industrial supplies will order anything from McMaster and you pay list, no shipping. Also larger outlets like Grainger, it's best to know exactly what you want when you walk in, very helpful if they are not busy, but if they are busy they don't like running back and getting things several times.
 
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