Both the Paragon and the Borg-Warner Velvet-Drive use plain metal discs as frictions for the forward clutch
. The Velvet-Drive uses them for it's reverse clutch
also. The Paragon uses a "band" that functions as a clutch for the reverse operation. It is a metal band (self-adjusting) and does not use a friction material. Clutch parts
for either transmission
are readily available and are not overly expensive, a complete shop re-build usually runs around $1000-1200 Canadian dollars labour plus parts. Westerbeke specializes in "marine-izing" other companies engines and has done thousands of Perkins 4-99, 4-107 and 4-108 engines, adding on various different makes of transmissions over the years. They still sell those same models today, because they are extremely reliable, long-lasting power plants. They generally only run them at 2500 to 3000 rpm
max., to make them last, but the Perkins engines were designed to be run up to over 4000rpm and produce as much as 40+ hp. They are "industrial" engines, built to run 10,000 hrs in some applications like generators. Pretty good track record!