I haven't done much lately but managed to check alignment on my flatmount bosses for Aderklint's frame and I've cut seattube to length.
lookin good! how did you line up the mitres for the flat mount posts? ive only used dropouts with integrated mounts but they are a bit ugly. would like to do as you have at some point
I used a milling machine. Found my datum using an edge finder and milled slots using a 16mm end mill.
@Biggles567 started
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I haven't done much lately but managed to check alignment on my flatmount bosses for Aderklint's frame and I've cut seattube to length.