I'm putting a Baby Bob on my P18 and can't move the boat or flip it for measurements right now.
Can anyone tell me how high the sheave housing sits, above the top of the flat casting? I'm guessing it's 2" or less.
The Baby Bob sits on Hobies 2" high stainless bracket so I think there's just enough clearance that plastic will never touch the sheave.
I'm bending 1/8" aluminum flatbar to form a U-shaped bracket as a mount. Trying hard not add any unneeded weight to the mast head.
If you have a P18 mast or casting handy, please stick a measuring tape on it for me. It would also help to know the width and length (on center) of just the casting.