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I'm modifying my frame and in the process of drilling some pipe I found out (the hard way) that the bolts securing the lowpro is not through the center of the pipe. Is there a functional reason for this or is it just to make them proprietary?
 

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I've encountered this as well and it is really annoying. I ended up drilling larger holes.

They almost seem hand done. I re- oriented the fittings 90
Degrees for a narrower boat. I couldn't even get them to line up with the original holes when I went to return to the original configuration.


-Dave
(Seven two 0) 298-2242
 

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NRS LoPro Frame Fittings are jigged and drilled (on a press) at the factory per cross member. NRS told me that they cut the "unbendable pipe" per order or frame configuration and then drill the pipe and LoPro. Every drilled LoPro is the a one off, drilled only for that piece of pipe and that specific end of said pipe.
I ordered new pipe and figured I would use the existing LoPro's. NRS forwarded my call to the workshop and the guy there gave me the LoDown. I still drilled the new pipe to fit the old LoPros. It was a little bit of a PITA. I used a Hand Tap Guide Standard V-Tap after I measured out the original holes. Some fitting are great and tight from pipe to LoPro. Others have a mild amount of slop. A larger diameter bolt might solve slop at the hole, but not the milimeter or so of slop between the LoPro and pipe. YMMV
 

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Poor drilling job, done by hand, even on factory ones. Too bad because it is really easy to make accurate holes in pipe with a simple jig.

Get a PVC fitting that fits over the aluminum tube, get the kind that can slide easily over the pipe, like a slip tee or repair coupling. Very carefully mark the center for two opposite holes. The easy way to do this is with a piece of stiff paper about 1/2" wide and long enough to wrap the fitting. Cut the strip of paper to fit exactly around the pipe, fold the paper in half an mark the half point. Now you have a 'ruler' that can place two holes in the exact center and opposite sides of the round fitting.

Mark up the PVC fitting and drill your two master holes, now you can use this as a jig to drill identical holes in any tubing end. Sawing a slot (lengthwise) in the jig will make it easier to slip on and off, use a hose clamp to clamp it in position.

To avoid the poorly drilled holes in factory loPro's you can order them un-drilled, or rotate the hole pattern 90 degrees in bad ones. I drilled out the male side of the LoPro slightly oversized to allow for some slop.
 

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Discussion Starter #6
Hand Tap Guide Standard V-Tap[/URL] after I measured out the original holes. Some fitting are great and tight from pipe to LoPro. Others have a mild amount of slop. A larger diameter bolt might solve slop at the hole, but not the milimeter or so of slop between the LoPro and pipe. YMMV
Yep, that is the lodown. I called NRS today before I saw this reply. They do the best they can, but the bottom line is that few are the same. What that means is that there is no such thing as "making a jig" that will fit your lopros and pipes. I can make a whole different discussion about that, but I'm going to digress and just go drill some new holes in the pipe with the lopros in place to insure that they fit. wish me luck and thaks for all of your help.
 
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