Need some input.
I am assembling/making a HPA discovery crosman based on the Don Cothran HPA tube & barns and Assoc Boss valve and front seal fill cap. The whole process was going very well until the final fill cap was to be installed. I Do not want to go into a long story but it seems the fill cap will not go in far enough to engage the o-ring. I am not sure if it is the threads on the tube or the possible out of round threads on the fill cap.
So to any one who has used a Don Cothran HPA tube, Did you go with stock Crosman discovery parts ? if so how did they work ?
Did you have any problems with the Don tube ? I does look very good.... to the eye.
I have used Dons tubes alot,never had a issue. I always used crosman parts, the fill port off a Disco Is what I used. Got a picture of both parts maybe post here or e mail me firstname.lastname@example.org.
Edit : Do you have another tube 2240-2250 that you can try putting the fill part
on, would be a easy way to check if you do.