Hello Jim,
I have a set of kitchen cabinets populated with your typical junk
level "Blum" type drawer slides/glides/guides, incapable of holding up
to substantial load when extended.
Been there. Honey complained until I fixed them.
Anyone had experience with replacing these with full-extension
ball-bearing guides? Alignment tricks, etc.?
I went to Home Depot and got the strongest ball bearing guides that
would fit. There was 1/2 inch space on either side. IIRC the guides are
rated at 100 pounds when fully extended (drawer completely out of
cabinet frame).
The trick is in very precise measurements since you cannot really align
much after they are mounted. Also, I threw away the screws that came
with them and got some heavy duty short ones for the drawer sides and
"Simpson Strong Ties" for the cabinet sides. Then I made large shims
from steel to avoid any bowing. Cabinets aren't always really square and
ball bearing guides do not like any veering. These shims must support at
least down to the lower edge of the rail or it will eventually bend.
Those two drawers are about 4-5 ft wide, a foot high and extend 3-4 ft.
Full of pots, cast iron pans and what not. All the heavy stuff. You can
touch them with one finger and they slowly glide back with only as much
as a faint hiss. Before it had required major wrestling and created an
awful screech.
Considering that your house is almost new compared to ours (1970) it's
surprising the guides already gave up. We still have most of the
original ones in place. A little lube spritz once a year keeps them going.
Also, carefully look at the drawer itself. Sometimes the sides start to
come off a bit. I had reinforced a few with wood pieces or gusset angles
on the insides.
Regards, Joerg