I needed something to pop out a sunken top on an M95 that I am quite attached to - but without hydrating the complete helmet as the old finish may be scarred and scratched but it is solid and I saw no sense in needlessly overexposing it to moisture. Also, from the inside, I did not want to risk the original liner which is complete with no rot, so I placed the wet kitchen towels in a plastic bag inside a kitchen storage jar and inserted it up into the skull before sitting the whole thing upright inside a sealed large clear plastic bag: the only part of the skull exposed to the moisture was directly beneath the sunken top. After a week I applied my secret weapon, a Heath Robinson device cobbled together from junk! A small bronze bowl, the equally curved top from a defunct bird feeder and a bolt with two washers and a wing nut. Left it clamped up for three weeks and the result was a perfectly restored dome that takes the spike base exactly as I needed. Maybe too much trouble for a helmet that most would pass by but it was my first and I love it! Before and after pictures attached.