I've talked to the guys at TBM and they were incredibly helpful. Not only did they give me a good deal on the accessories I bought, they went out of their way to head to the warehouse, measure a few wingtubes for ACTUAL diameter, and call me back with a selection of sizes. Great prices, great service. A few guys in my club use no one but Troy Built Models as the service is generally superb and they have good deals on some pretty expensive stuff (giant scale, etc.) I will not hesitate to use them again.