Not without a starting clamp. I would do something to keep a little back pressure on the clamped staring to make sure it doesn't slip when you tension the other. Chances are it will not but isn't worth the chance. Better safe than sorry.
Everyone has the right to be stupid... it's just that some people abuse the privilege...
Balance - 31.0 cm, Weight - 358 g, SW - 346 Kgcm^2