Where are you located? I have 7 proboxes in total. One contains my backup set, one is for general usage and 5 are unused. Complete including the original box. If you're in the US you can have one for the price of shipping.

I am considering making a jig to precisely drill and tap the existing proboxes and inserts for more grub screws to spread their load across more of the fin and finbox. Not sure if i would have gone with this system had I been aware of this potential weakness beforehand.


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I was going to design and build something like the Kreg pocket screw jig for drilling new grub screw holes through the probox and inserts, and then precisely tapping these holes for grub screws, perhaps of smaller diameter than the standard. I have sucesfully cast threads around fine thread small metric SS screws in epoxy, but there is no wiggle room and cross threading the screws is too easy and stripping the fine threads using too much torque was also too easy. But the 10-24 grub screw threads are coarse and much further apart in comparison to m4.

The probox center fin box grub screws are weirdly angled, pressing into the middle of the fin tab at more of a 45 degree angle. It could have been designed so there would be more material between tab recess and grub screw for greater strength, but was not. Custom fins for center probox need the grub screw Receptacle flat be up higher on the fin tab.

One can actually submerge proboxes slightly if they razor the tabs a bit so the box sits deeper in the board as resin cures. Then capping them less cloth need be sanded off to get it flush, then the inserts sit a bit recessed. Hard to get the cloth over the area between grub screw hole and insert though for adding strength to that area.

My Quad boxes which I either did not route deep enough or sanded the bottoms of the probox a smidge or both, got not only the lead weights, but a wood bar across both and then bricks for even more weight, as I could see more resin bulge out the sides with more downward pressure. Dry, I could not see if the box tabs were flush on the lam, but the resin bulging out the sides with more downward pressure indicated I needed to compress the 6 oz or 7.5 oz football patches I used in the routed hole under the Probox.

If I ever make another board with multifins, I Would go probably go for gearbox, over futures or fcs, assuming I could not get probox anymore and keep having issues with the grub screw getting ripped out.

A quick update: I got my shipment from FS, and it turned out they did have some white rail boxes in, but only with blue 0 degree inserts. I went through my entire probox related stuff and found that I have an overabundance of blue inserts, and a shortage of black. e24fc04721

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