HI Yes I guess that would be about right.The lip is quite thin after being turned down but it works just fine,I have done a few of these for friends and none have failed yet.The main problem with the Petter A as it stands is the angle of the front plate to the mag body,it is too far out for the mag to work properly,also the fixing bolt hole slots need to be machined out to 3/8" to fit the larger Wolseley studs.I also forgot to say that if you want to e-mail me do not use the one registered with the newsgroup,this is just a spam magnet.Use my snipped-for-privacy@hotmail.com one but insert an extra o, i.e. woolseley.@............... Cheers.
Kenny Williams
The wild and woolseley scotsman.