Thanks Bill, very much appreciated,those inserts look manageable to make. I've no idea how I misread the section on the bulbs,it's as plain as the nose on my face
You could be correct about the corrosion,this enlarger seems to have been in storage in a shed,I've already had to vasaline the seized focusing friction drives,their moving fine now.
Another question if I may,mine doesn't seem to have the two screws for removing the condenser,(I only got one) it came with a 50mm lens and Siriotub, I'm assuming it's set up for 50mm only,I can't see any markings to say it's the double condenser for the 80mm. For fear I've missed something in the manual I'll reread that section on removing it but I've had all the screw out around the head itself but to no avail. Thanks again for the info.
Tommy.