Guido mdf H9800 clones that need work.

[Guido]

Thanks Herve, 102mm PCD?

If there is a 4" bolt circle on the adapeter plates it was very likely made for a driver with a 4" bolt circle (e.g. Radian 951PB 1,4" exit). Makes sense, or not?
We sell lasered adaper plates for other bolt circles also...just as an alternative for hand-drilling. Beside 1.5" we also sell 1.4" horns

The 1,4" possibility would also explain the "irregularities" of the throat.

Whatever, if a clean, new horn is needed it can be ordered with a matching adapter plate. Easy. The new horns look a lot better also.