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The only issue I’ve had with my Bestem 929 T-case is that it rattles with sharp bumps. It’s not the case itself but, its mounting with the plate. Today, I did some mods that have cured the rattles!
On the front posts of the mounting plate, I pushed on an item called a slip joint washer. These come in various styles, and the one that works came from ACE Hardware, shown here as packaged:
[attachment=1:3uk6egro]Slip Joint Washer in Package.jpg[/attachment:3uk6egro]
It looks something like a short T-nut (expansion nut) like used to mount the bike’s windshield, but without the threaded insert. Here's a better picture of the part out of the package:
[attachment=0:3uk6egro]Slip Joint Washer.JPG[/attachment:3uk6egro]
I placed the slip joint washer with the large end down, against the plate. I then trimmed off the sides of the narrow section to allow the top case to slide on (otherwise, it would make the post diameter too large). I topped this off with a #74 O-ring. This provides a nice, snug fit for the grooves on the front of the box. Here's the assembly:
[attachment=4:3uk6egro]Front post mod.JPG[/attachment:3uk6egro]
I had previously just tried using a couple of O-rings, one at the top of the post and the other at the bottom but, they deformed easily. Next, I pulled off the rubber push-on bumpers (I’m not sure what to call them) near the rear corners of the mounting plate, and replaced them with 1/2" long T-nuts, with the threaded end down and ¼” long machine screws coming up through the plate, with lock washers on the underside. I used the fattest ones they had in this length. Here's what one looks like installed:
[attachment=3:3uk6egro]Rear bumper mod.JPG[/attachment:3uk6egro]
I did the mods to both my and my wife's 400's. Here's what the mounting plate looks like on hers with everything in place (Note I haven't done the wiring, yet):
[attachment=2:3uk6egro]Mounting plate with post and bumper mods.jpg[/attachment:3uk6egro]
Now, the boxes fit snugly on the front posts (takes a little jiggling to seat well). The back end also takes more effort to clamp into place, due to having to compress the T-nuts. Together, these quick and cheap mode removed rattles on a test loop I did where I would normally hear them.
On the front posts of the mounting plate, I pushed on an item called a slip joint washer. These come in various styles, and the one that works came from ACE Hardware, shown here as packaged:
[attachment=1:3uk6egro]Slip Joint Washer in Package.jpg[/attachment:3uk6egro]
It looks something like a short T-nut (expansion nut) like used to mount the bike’s windshield, but without the threaded insert. Here's a better picture of the part out of the package:
[attachment=0:3uk6egro]Slip Joint Washer.JPG[/attachment:3uk6egro]
I placed the slip joint washer with the large end down, against the plate. I then trimmed off the sides of the narrow section to allow the top case to slide on (otherwise, it would make the post diameter too large). I topped this off with a #74 O-ring. This provides a nice, snug fit for the grooves on the front of the box. Here's the assembly:
[attachment=4:3uk6egro]Front post mod.JPG[/attachment:3uk6egro]
I had previously just tried using a couple of O-rings, one at the top of the post and the other at the bottom but, they deformed easily. Next, I pulled off the rubber push-on bumpers (I’m not sure what to call them) near the rear corners of the mounting plate, and replaced them with 1/2" long T-nuts, with the threaded end down and ¼” long machine screws coming up through the plate, with lock washers on the underside. I used the fattest ones they had in this length. Here's what one looks like installed:
[attachment=3:3uk6egro]Rear bumper mod.JPG[/attachment:3uk6egro]
I did the mods to both my and my wife's 400's. Here's what the mounting plate looks like on hers with everything in place (Note I haven't done the wiring, yet):
[attachment=2:3uk6egro]Mounting plate with post and bumper mods.jpg[/attachment:3uk6egro]
Now, the boxes fit snugly on the front posts (takes a little jiggling to seat well). The back end also takes more effort to clamp into place, due to having to compress the T-nuts. Together, these quick and cheap mode removed rattles on a test loop I did where I would normally hear them.
