an slight update. after 100 km or so of driving applying the tt brakes manually lots to seat in the shoes, there's a very minor improvement. but I can still pull the tt easily with the breakaway pulled out. on gravel the wheels skid very slightly but still turn
I spoke to our local dealer's mechanic and dexter, both agreed that 7 inch brakes should never have been used.
so a conversion to 10 inch is in the works
10 inch brakes are not available for the 2200 axles, so some research is needed.
it turns out that the 2200 drum/hub uses 2 identical bearings, cant remember the number but the id is 1 1/16 (1.0625) inches
10 inch brake/hubs use the same bearing on the outer end and a larger inner bearing and seal, typically 1 3/16 id but other sizes are available
so my local bearing guy says that a compatible bearing and seal should be available, ie fits both the hub and the smaller spindle, the other option is get a bushing, also commonly available.
where is a good place to order the brake assemblies and drum/hubs? prices in Canada are astronomical compared to etrailer.com for example. crossing th border to pu the parts is easy, port huron mi is 10 minutes away from us