size? allen bolt heads duplex mantaray 604 904 mr902-16H...

[gearfreak]

What the heck size allen / hex / key / wrench are the 604 / 904 / MR902 etc. horn bolts?

I'm talking about the small black front-facing ones with the knurled sides, you see them on either side while staring down the throat.

* not to be confused with the mounting bolt thread pitch/size thread here: What size are the screws in a 902-16

I've tried:
2.5mm - too small
3.0mm - too big

3/32" - too small
1/8" - too big


I've got a strange resonance in my 904, prominent roughly at 50-100hz that I am trying to track down - so figured I'd check to see if the horn was loose. Gently pushing/pulling on the horn can exacerbate or temper it, but doesn't remove it.

Advice for/against/regarding pulling the horn out is welcome. (Maybe it's cracked somewhere).

I'll probably pull it out and check everything around back before pulling the horn - unless it's easier than imagined.

thanks!

[C.DARRELL FREEMAN]

hello,those bolts/screws may be a torx drive(ie,t-5,t-10,t-15,etc).similar to allen head,but not exactly the same.

[gearfreak]

hello,those bolts/screws may be a torx drive(ie,t-5,t-10,t-15,etc).similar to allen head,but not exactly the same.

Thanks CDF!

yup, I'll be damned. A T-15 torx works, despite the bolts not having the typicall torx 'fluting' / scalloped look.