can anyone tell me the exact length of the extension for the jet 1221vs,the model number is 719201,,,and also can anyone give me their experience with mounting it,,compared to other extensions for other lathes this one seems kinda high,,199.00 is the best price i can find,,,,actually i just bought this lathe and it was between this one and the delta 46-460,,,which was sold out,,,,can anyone give me their option of either one,,thank you