Several choices with the HS gear...I've built 3 of them....if you haven't ordered the gear yet, then you can request Kangaroo lower strut units for the HS 630 gear...same price....talk to Eric at Robart.....they are 3/16" vs 1/4" axles on the HS version.....the upper struts are shorter on the Roo so can't just substitute Roo gear, but the lower struts are identical.....the nose strut for the Roo vs HS is virtually identical, within about 1/16"...forgot which one is longer, so they are interchangeable and have 3/16" axles......haven't tried the new bushing from Robart, but they should work.....I do like BVM 3/16" axle set.....they are super honed and polished with perfect C-clip groove in place.....better than some of the dowel pin stuff on the market....

While knocking out the bushings and replacing with new !/4" bushes would definitely work, many BVM W/B users, self included, have had the experience of steel vs brass galling and seizing up the wheel, flattening the tire......major irritation and unpredicatable, so have to lube regularly.....the new BVM W/B come with Oilite bushings so it is much less likely to happen...so if you have to replace, try to get a 1/4" Oilite bushing......if not, be sure to scuff both the axle and the bushing with medium grit, about 80, emory cloth....the more scratches, the better to trap the grease....

Finally, Intairco makes a great W/B in different sizes that have 1/4" axles...just got a set for my Eurosport......not sure about Trim.....Glennis W/B set for HS also comes with 1/4" axle.....

Tom