hy goemon
that's true, more precise, there is a chance to happen; is not possible to push such systems, as they are fragile
at least you tried ... if i may ask, what are you going to do now ? what tir did you noticed before starting this thread/conversation, and what tir do you wish to achieve ?
i would like to sugest 2 rigid solutions :
... weldon type with excentric bush : basically, you change arbor, and use a set of bushes; for example, if you noticed tir of 0.01, then you need a bush with excentricity of 0.01; this requires having a set of bushes that is corelated with expected tir ( i have done this )
... keep your er chuck, but make it a separate part from the arbor (like a flange), tir being adjusted with screws; the difference between this solution and an adjustable tir collet, is that here you may use bigger screws, that will ofset the er chuck entirely; this again may be shifted by cutting forces, but being more rigid, it will resist better than the adjustable er nut ( i have seen this being recomanded by others )
* unfortunately, both solutions do not exist as being able to buy them, thus requires to custom build them / kindly