DIY GPR378 J-hooks (Lots of pics)

[donforeman]

I saw in the other thread where someone paid $45 for UHMW! Eeek!
http://www.drillspot.com/products/44...V9_Sheet_Stock for 1/8
http://www.drillspot.com/products/51...ed_sheet_stock for 1/4

Now there is a reason for the 1/4 = I am bolting it down and the countersink head requires some depth.

I'm working on the second set of hook now and might cut the UHMW today or tomorrow and post a how too then. I did learn a little from the first set and the second set will be slightly different. Just some small changes.

[donforeman]

I discovered the the GPR378 uprights are somewhat warped. The NYB had exactly 3" of clearance, and while they slipped on without a problem in some places, they generally didn't fit. It was weird. I'd have to slam them in place with the palm of my hand on one spot and practically need a hammer to get them off, but if I moved up three holes they would slip right on.

Yes Body solid punches the holes, so it distorts the metal. I used spacers on the jig to make the area just a hair bigger than 3". There are tight spots and slightly looser spots, but they just slide on.

[weisgarb]

Great, informative post.
Can you please post the source and item no of that UHMW as well as what kind of glue you used on them.

Sure, I provided more detail over in BAVE's thread this morning. The SKU # of the UHMW was 517355, although I would have gone for a thinner version if I had to do it again.

Edit: Don posted links to the actual UHMW product a few posts above. If you want to screw it down, I'd go for the 1/4", but if you want to use adhesive tape, I'd probably pick 1/8". My sheet was slightly warped when I got it, so I had to spend a little effort trying to flatten the entire thing. You don't have to use heat--I found that bending the plastic in the opposite direction seemed to work even when cold.

[Andrew_WOT]

Thanks buddy, very helpful.

Sure, I provided more detail over in BAVE's thread this morning. The SKU # of the UHMW was 517355, although I would have gone for a thinner version if I had to do it again.

Edit: Don posted links to the actual UHMW product a few posts above. If you want to screw it down, I'd go for the 1/4", but if you want to use adhesive tape, I'd probably pick 1/8". My sheet was slightly warped when I got it, so I had to spend a little effort trying to flatten the entire thing. You don't have to use heat--I found that bending the plastic in the opposite direction seemed to work even when cold.

[Skidmarx]

I saw in the other thread where someone paid $45 for UHMW! Eeek!

You can get sheets on ebay pretty cheap

[donforeman]

Second set of hooks done. I didn't get to the UHMW today. Had a some people drop by mid day.

[donforeman]

Marking holes in the UHMW with a white paint pen because some dope got the holes slightly offset from center. It was cut with a saw the razor knife is for deburring the edges.

I will take off the plastic and give it a coat of black later.

[817boy]

nice job

[donforeman]

[valetudo8080]

Nice work Don....much better than the ones that come with it...yours' are more of a true powerlifting J hook.

I like your becuase you could probably keep in a better position when you unrack the bar.

Thanks
Matt at Fitness Factory