Mine had a K&B 65 (one flight), then an old K&B 61(two flights) and then went to switch to a 70 OS surpassII and the mount was cracked. I bought some thicker aluminum strip at the HW store ($3 for 4 feet) and cut some new ones. Works great, not broken yet (knock on wood) and I have enough for another 8 pairs of mounts, like the plane will last that long. Flies very well with the .70!
Daze