Neway valve seat cutter part number or size recommendations 850 mk3

Can anyone advise on the recommended part numbers for Neway valve seat cutters to fit both inlet and exhaust? With the cost of them being so expensive I’m trying to minimise the cost and find a cutter that covers both valve sizes if possible.
CU608 seems about the closest having a range of 28.5 - 37.5mm (850 mk3 Commando valves range - 31.75 - 38.1mm). It’s ever so close and just wondered if it possible to nudge the cutting blade a little bit more out?

Lovel said:

It’s ever so close and just wondered if it possible to nudge the cutting blade a little bit more out?

Click to expand...

Yes it is and it works as its what I predicted before buying and confirmed when using. The insert blades are long and get good support in the head so can stick out a bit.

The two options are CU626 and CU622H, both cover a range out to 47mm. The difference between the two being the angle of the seat and topping cuts (30/45 or 31/46)

edit: don't be heavy handed or you will destroy the seat (been there, done that, have the T-Shirt), finger pressure only until you feel uniform and concentric contact, then 1 or maybe 2 turns with the spring loaded handle IMHO

British cycle sells the neway kit and lists the parts.

I bought my kit years ago, just stopped at their plant.
Give them a call. Friendly guys.
Neway Manufacturing Inc.
1013 N Shiawassee St
Corunna, MI 48817
1-800-248-3889
https://www.newaymfg.com/
info@newaymfg.com

Sorry guys but I have bottled it and sent the head to SRM for guide fitting and seat cutting. After adding up the costs, import duty shipping it‘s just not viable in my mind. The eBay seller wasn’t able to combine postage either so have reluctantly given up doing them myself.