tacho expansion, heavy?!

Tach zamma ,….. mal ne befrage …. has one of you (yes, which will give e.g. our guru mellow) who have expanded their tacho? will this namlcih be allowed to do soon … in the next days …. wanted to ask if there is anything to consider? screwing there are only three ‘outside’, and then the whole kick away – remove all, and then when tacho 4screw away – old tacho out – new in (following is the same, or not to do wrong*g) and then likeda Is it really easy to get out? best to take slaves with you or is it easy alone?? so write nice, and help me Gree Micha