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I too used to do a fair bit of solar projection as a teenager. School telescopes in those days came with a solar projection screen attachment to make this easy and straightforward. The scope I built myself from a Carl Zeiss kit (55mm achromat, eyepiece holder and two Huygens eyepieces) didn't have that but it was easy enough to rig up a screen. Being Huygens the eyepieces weren't as much in danger of being damaged, but I don't remember them getting hot anyway.
Projection was considered the safest method of showing the Sun and solar eclipses to kids, guests etc. We didn't have access to solar filters back then and welders glasses or soot blackened glass were the only other options (inferior of course from a safety point of view).
Cheers
Steffen.
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